A menstrual sea sponge is a reusable internal period product made from natural sea sponge. It absorbs menstrual flow inside the vaginal canal and is removed, cleaned, dried and reused according to the manufacturer's instructions.
Using one safely involves more than simply rinsing and reinserting it. Natural sea sponges are porous, vary in shape and density and do not have standardised cleaning or wear instructions.
The safest approach is to use a sponge sold specifically for menstrual use, inspect it carefully before every insertion and follow the cleaning, wear-time and replacement instructions supplied with that product.
Research on menstrual sea sponges is limited. Historical testing identified grit and microorganisms in some products, while more recent research has raised additional questions about product quality and regulation. This does not mean every menstrual sponge is unsafe, but it does mean that cleaning, wear time and replacement should be adhered to.
Not sure whether you have a reusable natural sponge or a single-use synthetic sponge? See our Menstrual Sponge Comparison Chart. The two product types have different care, wear and disposal instructions.
How to use a menstrual sea sponge: the quick guide
- Read the instructions supplied with your exact sponge.
- Wash and dry your hands.
- Inspect the sponge for debris, damage, loose pieces or an unusual odour.
- Clean it before first use using the manufacturer's approved method.
- Wet the sponge with clean water and squeeze out the excess.
- Compress it between your fingers into a comfortable shape for insertion.
- Guide it gently into the vaginal canal, aiming back towards your tailbone rather than straight upwards.
- Remove and clean it within the manufacturer's wear time, or sooner if it becomes saturated, leaks or feels uncomfortable.
- After use, clean it as directed and allow it to dry completely before storage.
Never force a sponge into place or continue wearing one that causes pain, pressure, burning, unusual irritation or difficulty urinating.
What is a menstrual sea sponge?
A menstrual sea sponge is a piece of natural sea sponge prepared for internal menstrual use.
Unlike a menstrual cup or menstrual disc, which collects menstrual fluid, a sea sponge absorbs menstrual flow.
When wet, the sponge softens and can be compressed for insertion. Once inside the vaginal canal, it expands to fit the available space.
Because sea sponge is a natural material, individual sponges can differ in:
- size
- shape
- density
- texture
- absorbency
Reusable natural sea sponges should not be confused with single-use synthetic menstrual sponges.
Single-use products have their own insertion, wear-time and disposal instructions and may also be specifically designed for uses that do not apply to natural reusable sponges.
Compare the two in our Menstrual Sponge Comparison Chart.
Before using a menstrual sea sponge for the first time
Choose a product intended for menstrual use
Do not insert a cosmetic, household or unlabelled sea sponge.
Choose a product with traceable supplier information and clear instructions covering menstrual use, cleaning, wear time and replacement.
Inspect the sponge carefully
Examine the sponge in good light before its first use and again before every insertion.
Gently separate the folds and look for:
- sand, shell, grit or other embedded material
- hard or sharp areas
- tears or thinning
- crumbling or loose pieces
- a significant change in texture
- an unusual or unpleasant odour
If you find embedded debris, damage, loose material or an odour that remains after cleaning, do not insert the sponge.
Visual inspection is useful for detecting physical problems, but it cannot confirm that a natural sponge is free from microorganisms or chemical contaminants.
Clean it before first use
Clean the sponge using only a method approved by its manufacturer.
Instructions vary between brands and some specifically advise against boiling or particular cleaning agents.
If your sponge arrived without clear care instructions, contact the supplier before using it rather than relying on a generic cleaning method found online.
How to insert a menstrual sea sponge
- Wash and dry your hands. Use soap and clean running water.
- Wet the sponge. Hold it under clean water until it becomes soft and flexible.
- Squeeze out the excess water. It should be damp rather than dripping wet.
- Compress the sponge. Pinch or roll it into a narrower shape that is comfortable to hold.
- Find a relaxed position. You might sit on the toilet, squat or stand with one leg raised.
- Guide it in gently. Aim back towards your tailbone, following the natural angle of the vaginal canal rather than pushing straight upwards.
- Check the position. The sponge should sit fully inside the vaginal canal and feel comfortable. It does not need to be pushed firmly against the cervix.
A small amount of water-based lubricant around the vaginal opening may help if insertion feels dry, provided the manufacturer permits its use.
Stop if insertion is painful. Do not repeatedly push against resistance.
If tampons, fingers, cervical screening or other vaginal penetration are regularly painful or difficult, an overactive pelvic floor or a condition such as vaginismus may be contributing. Speak with a healthcare professional rather than forcing an internal product into place.
How to remove a menstrual sea sponge
- Wash and dry your hands.
- Choose a relaxed position. Sitting on the toilet or squatting may help.
- Relax your pelvic floor. Try not to repeatedly tighten or pull upwards.
- Bear down gently, as if having a bowel movement. This may help bring the sponge closer to the vaginal opening.
- Locate the sponge. Insert your thumb and index finger and gently grasp an outer edge.
- Draw it down slowly. Keeping it reasonably level may help reduce spilling.
- Clean it using the method approved for your product.
Do not use tweezers, scissors or another sharp object to retrieve a sponge.
If you cannot reach it, stop repeated pulling or straining. Give your muscles time to relax and try again in another comfortable position.
Seek medical assistance if the sponge remains out of reach, removal causes significant pain or you develop unusual discharge, odour, bleeding, fever or pelvic pain.
How to clean a reusable menstrual sea sponge
There is no single cleaning method that applies to every reusable menstrual sea sponge.
Follow the current instructions for your exact product and do not combine cleaning agents or create stronger solutions than recommended.
It is also useful to distinguish between cleaning and sterilising. Cleaning removes menstrual fluid and visible residue. A manufacturer-approved wash or soak may form part of a sponge's care routine, but a reusable natural sponge should not be assumed to be sterile after home cleaning.
Cleaning between removals
- Rinse the sponge thoroughly under clean running water.
- Compress and release it repeatedly so water moves through the internal pores.
- Continue until the water runs clear and no visible menstrual fluid remains.
- Use the manufacturer-approved cleaning method when directed.
- Rinse thoroughly after any permitted soap, cleanser or soak.
- If reinserting immediately, squeeze out excess water. If storing it, allow it to air-dry completely.
Follow the instructions for your brand
Natural Intimacy: current instructions allow washing with mild soap or a timed soak using a specified vinegar dilution or baking soda solution. The sponge should then be thoroughly rinsed and air-dried. The brand advises against boiling, harsh chemicals and soaking for longer than directed.
Jade & Pearl Sea Pearls: current instructions provide several permitted care methods and advise against boiling, harsh chemicals and soaking longer than recommended. Follow the method and quantities supplied with your sponge.
Product instructions can change, so recheck the current directions rather than relying on a cleaning routine remembered from another brand or an older sponge.
Can you boil a menstrual sea sponge?
Do not boil a natural sea sponge unless the manufacturer specifically instructs you to do so.
Current instructions for Natural Intimacy and Jade & Pearl advise against boiling because excessive heat can cause natural sponge material to shrink, toughen or deteriorate.
Can you use vinegar, baking soda, peroxide or essential oils?
Only use a substance if the manufacturer of your exact sponge specifically lists it and provides the correct dilution and soaking time.
Do not:
- make a stronger solution than directed
- extend the soaking time
- combine cleaning products
- assume a cleaning method recommended for one brand is suitable for another
Rinse away any permitted cleaning solution thoroughly before reinsertion and stop using the sponge if it causes irritation.
How long can you wear a menstrual sea sponge?
There is no universal maximum wear time for all menstrual sea sponges.
Wear time depends on the instructions supplied with the particular product.
- Jade & Pearl Sea Pearls: current instructions advise removal after 3–4 hours, or more frequently with heavier flow.
- Natural Intimacy: current instructions advise removing and cleaning the sponge at least every 8 hours, or more frequently when needed.
Remove your sponge sooner if it:
- becomes saturated
- starts leaking
- feels uncomfortable
- develops an unusual odour
Do not extend the recommended wear time simply to get through a workday, overnight sleep or another activity.
If the full time from insertion until waking would exceed the manufacturer's instructions, choose another period product for overnight use.
Can you trim a menstrual sea sponge?
Some reusable natural sea sponges can be trimmed to adjust their size or shape, but only if the manufacturer permits it.
- Start with a clean sponge and clean scissors.
- Trim only a small amount from an outer edge.
- Round any uneven or ragged areas.
- Do not tear the sponge or cut it in half unless the manufacturer specifically permits this.
- Clean the sponge again after trimming.
- Inspect it carefully for loose pieces before insertion.
Do not trim away a damaged, contaminated or deteriorating section and continue using the remainder. Trimming is for adjusting fit, not extending the life of a sponge that should be replaced.
If you're deciding between sizes, compare the available options in our Menstrual Sponge Comparison Chart.
When should you replace a menstrual sea sponge?
Follow the replacement period supplied by the manufacturer.
Some brands suggest replacing reusable sea sponges after approximately 3–6 months with appropriate care, but this does not mean every sponge will remain suitable for that entire period.
Replace it sooner if you notice:
- tears
- thinning
- crumbling or loose pieces
- a lasting change in texture or firmness
- embedded debris
- an unusual odour that remains after cleaning
- irritation or pain associated with use
Some staining may occur over time and is not necessarily the same as deterioration. However, staining accompanied by odour, physical damage or a noticeable texture change is a reason to replace the sponge.
When should you avoid using a menstrual sea sponge?
Do not use a reusable menstrual sea sponge if:
- it is not specifically intended for menstrual use
- it has no clear manufacturer or care instructions
- it contains embedded grit, shell, debris or sharp areas
- it is tearing, crumbling or deteriorating
- it has an unusual odour that remains after cleaning
- insertion or wear causes pain, burning or significant pressure
- you have been advised to avoid vaginal insertion
- you are experiencing symptoms of a vaginal infection or unexplained irritation
- you cannot remove it comfortably
Speak with a healthcare professional before using internal menstrual products if you have previously had toxic shock syndrome.
Are menstrual sea sponges safe?
The evidence base for reusable menstrual sea sponges is limited. This makes it difficult to provide the same level of safety certainty available for some more standardised menstrual products.
Historical US testing found sand, grit, bacteria, yeast and mould in samples of natural menstrual sponges, with one sample confirmed to contain Staphylococcus aureus.
A small study published in 1982 also reported differences in vaginal bacterial colonisation among users of sea sponges compared with tampon and pad users.
More recent research adds reasons for caution but should not be overgeneralised.
A 2023 case report described an adolescent with a retained natural sea sponge embedded in the vaginal wall. This was an individual case and does not establish how commonly this occurs.
A 2025 laboratory study examining menstrual and intimate-care products included five sea sponges and found higher leaching levels of several metals and metalloids in that small product group than in the other product categories tested. The study does not tell us what exposure or health outcome an individual sea-sponge user will experience.
In March 2026, the Therapeutic Goods Administration's Women's Health Products Working Group discussed concerns about the current access framework and regulation of menstrual sponges, including opportunities for clearer product standards and improved oversight.
This was a regulatory discussion rather than a finding that every menstrual sponge sold in Australia is unsafe.
Together, the available information supports a cautious approach:
- choose a traceable product specifically intended for menstrual use
- inspect it before every insertion
- wash your hands before handling it
- follow the manufacturer's cleaning instructions
- stay within its stated wear time
- replace it when directed or sooner if it deteriorates
If the remaining uncertainty around natural sea sponges is not something you're comfortable with, consider another period-care option. Our guide to choosing between a menstrual cup, disc or sponge can help you compare different reusable internal products.
What about toxic shock syndrome?
Toxic shock syndrome (TSS) is rare but serious.
Possible symptoms can include:
- sudden high temperature
- vomiting or diarrhoea
- dizziness or faintness
- muscle aches
- confusion
- a red rash that may resemble sunburn
If you develop symptoms that could indicate TSS, remove the sponge if you can do so promptly and seek urgent medical care. Call triple zero (000) and ask for an ambulance or go to your nearest emergency department.
Do not delay urgent care because you cannot remove the sponge yourself.
Special considerations
Can you use a menstrual sea sponge with an IUD?
A menstrual sea sponge does not create the same type of seal as a menstrual cup, but removal may still bring your fingers close to your IUD threads.
Ask the clinician who manages your IUD whether a reusable sea sponge is suitable for you.
During removal, make sure you have grasped the sponge itself rather than pulling anything that feels like a thread.
Seek medical advice if you develop new pelvic pain, cannot feel your IUD threads when you normally can, notice that they feel significantly different or think your IUD may have moved.
Can you use a menstrual sea sponge after birth, miscarriage or pelvic surgery?
Do not use a menstrual sea sponge to manage postpartum bleeding.
After giving birth, miscarriage, abortion or a gynaecological procedure, follow the advice of your healthcare team about when vaginal insertion and internal menstrual products can be resumed.
Until then, use the external products recommended for your recovery. You can also browse our recovery-friendly period care options.
Can you have penetrative sex while wearing a menstrual sea sponge?
Only use a menstrual sponge during penetrative vaginal sex if the manufacturer specifically states that the product is suitable for this use.
Do not assume a reusable natural sea sponge is suitable for penetrative sex simply because some single-use synthetic menstrual sponges are designed or marketed for period sex.
A sponge may also move higher during sex and become more difficult to reach afterwards.
A menstrual sponge is not contraception and does not protect against sexually transmitted infections.
Read our Period Sex Tips for more practical information.
What if you have a heavy period?
A menstrual sea sponge may saturate more quickly on a heavy-flow day, so check it sooner than the maximum wear time while you learn how frequently you need to change it.
Sponge absorbency is not standardised, so size alone does not reliably predict how long a sponge will last before becoming saturated.
A larger or denser sponge may hold more fluid than another sponge, but natural variation means you should not use sponge size as a guaranteed measure of absorbency or wear time.
Backup protection can be useful while you're learning your pattern.
If you regularly need to change a pad or tampon every 1–2 hours, bleed for more than eight days, pass large clots, bleed through clothing or find that your bleeding significantly disrupts daily life, speak with a healthcare professional.
You can also browse our period care options for heavy flow.
How to store a menstrual sea sponge
- Clean and rinse the sponge according to its instructions.
- Squeeze out excess water without twisting or tearing the sponge.
- Place it on a clean surface where air can circulate around it.
- Allow it to dry completely.
- Store it in the breathable bag or container recommended by the manufacturer, away from moisture, dust and contamination.
Do not seal a damp sponge in an airtight container.
Inspect it again before the next use.
Frequently asked questions
Can I sleep with a menstrual sea sponge?
Only if the entire wear period, including the time the sponge was inserted before going to sleep, remains within the manufacturer's stated wear time.
There is no universal overnight wear recommendation for sea sponges. If sleeping with your sponge would take you beyond its stated limit, use another period product overnight.
Can I rinse a sea sponge and immediately reinsert it?
If the manufacturer permits reuse during the same menstrual cycle, clean the sponge according to its instructions before reinserting it.
Do not simply squeeze out menstrual fluid and reinsert it without completing the required cleaning or rinsing step.
How do I know when my menstrual sponge is full?
You may notice leaking or the sponge may feel heavier or more saturated when you remove it.
While learning how it works with your flow, check it earlier than the maximum allowed wear time. This can help you work out your own changing pattern without deliberately waiting for it to leak.
Does a larger sea sponge absorb more?
Possibly, but not predictably.
Natural sea sponges vary in size, density, pore structure and shape, and absorbency is not standardised across products.
Choose a size based on fit and comfort as well as your flow rather than assuming the largest sponge will always last longest.
Can I cut my sea sponge smaller?
Some brands permit trimming.
If yours does, remove only a small amount at a time, keep the edges smooth and clean the sponge again before use.
Do not trim a damaged or deteriorating sponge in an attempt to continue using it.
Can I boil my menstrual sea sponge to sterilise it?
Not unless your manufacturer explicitly instructs you to.
Natural sponge material can be damaged by boiling and several menstrual sea sponge brands specifically advise against it.
Can a menstrual sea sponge get lost inside me?
No. The vagina ends at the cervix, so a sponge cannot travel into your abdomen.
However, a soft sponge can move higher in the vaginal canal and become difficult to reach.
Relax, squat or sit on the toilet and bear down gently to help bring it lower. If you still cannot remove it, seek medical assistance rather than using an object to retrieve it.
Can I use a natural sea sponge for period sex?
Only if the manufacturer of your exact product specifically states that it is suitable for penetrative vaginal sex.
Reusable natural sea sponges and single-use synthetic sponges are not interchangeable.
How long does a reusable sea sponge last?
Follow the replacement period supplied by the manufacturer.
Some brands suggest around 3–6 months with appropriate care, but replace the sponge sooner if it develops tears, crumbling, persistent odour, embedded debris or a significant change in texture.
The bottom line
A reusable menstrual sea sponge can provide a soft, low-profile period-care option, but it requires more attention to product quality, cleaning and wear time than simply rinsing and reinserting it.
Use only a traceable sponge intended for menstrual care, inspect it before every insertion and follow the cleaning, wear-time and replacement instructions for your exact product.
Remember:
- there is no universal cleaning method
- there is no universal wear time
- size does not reliably predict absorbency
- a cleaned sponge should not be assumed to be sterile
- reusable natural and single-use synthetic sponges have different instructions
If the sponge causes pain, persistent irritation, unusual discharge, odour, urinary symptoms or bleeding that is different from your usual period, remove it and seek medical advice.
If you develop possible symptoms of toxic shock syndrome, seek urgent medical care.
Need help choosing or troubleshooting?
Want to compare different sponges? See our Menstrual Sponge Comparison Chart.
Not sure whether a cup, disc or sponge suits you? Read How to Choose Between a Menstrual Cup, Disc or Sponge.
Want personalised help narrowing your options? Take the Find Your Best Fit Quiz.
Having trouble with a sponge you already own? Our Menstrual Sponge Troubleshooter checks fit, trimming, placement, absorbency and comfort before suggesting what to try next.
Want to compare all your period-care options? Visit the Menstrual Products Comparison Hub.
Related reading
- Everything You Need to Know About Period Sponges
- Menstrual Sponges Comparison Chart: Reusable vs Disposable
- How to Choose Between a Menstrual Cup, Disc or Sponge
- Toxic Shock Syndrome (TSS)
- Period Sex Tips
This article provides general information and is not a substitute for individual medical advice. Speak with a qualified healthcare professional if you have symptoms, pain or concerns about your health.
Sources
- US Food and Drug Administration, CPG Sec. 345.300 Menstrual Sponges
- Smith CB et al., Bacterial flora of the vagina during the menstrual cycle: findings in users of tampons, napkins and sea sponges
- Golub SA et al., The Use of “Natural” Substances for Menstrual Hygiene: A Case Report of an Embedded Vaginal Sea Sponge
- Marcelis Q et al., Chemical characterization of menstrual and intimate care products: An extractables & leachables investigation
- Therapeutic Goods Administration, Women's Health Products Working Group meeting #12, 31 March 2026
- Healthdirect Australia, Toxic shock syndrome
- Healthdirect Australia, Heavy periods
- Period Shop, Natural Intimacy Menstrual Sea Sponges instructions
- Period Shop, Jade & Pearl Reusable Sea Pearl Classic Menstrual Sponge instructions