How do you keep paddling pool water clean?
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Part of our pool and hot tub water guide
The sun is out, the pool is up, and by teatime there are leaves and a film on the water. What do the UK bodies actually say about keeping it clean, and what can you check yourself with a 20-in-1 test strip?
Short answer: In the sources we read, no UK body gives a cleaning routine for a home paddling pool. RoSPA says to empty it straight after use. The NHS says to stay out of swimming pools for at least 48 hours after stomach bug symptoms stop, and UKHSA says 2 weeks after diarrhoea stops for cryptosporidiosis.
By Andrew Tomlinson, WaterKit · Last reviewed 25 October 2026
How do you keep paddling pool water clean?
By not leaving it standing and keeping anyone with diarrhoea out of the water, which is as far as the UK sources we read go. None of them has a cleaning routine or standard for a home paddling pool, so the only checks left are your own. You can look at chlorine, pH and alkalinity bands in your fill tap and in the pool with a 20-in-1 test strip. What the sources do say is below, with who each line is written for.
| Source | What it says | Written for |
|---|---|---|
| RoSPA, garden safety | Always supervise children near water. Empty paddling pools straight after use, and put them away because rain can refill them | Home gardens. It is drowning prevention advice, not water quality advice |
| NHS, diarrhoea and vomiting | Do not use a swimming pool until at least 48 hours after your symptoms stop | Anyone with a stomach bug. It names swimming pools, not paddling pools |
| UKHSA, cryptosporidium | Do not go swimming or take your child swimming while you have diarrhoea and for 2 weeks after it stops. Avoid swallowing water in lakes and swimming pools | People with cryptosporidiosis, and everyone for the swallowing advice. It names swimming pools and splash pads |
| UKHSA, schools and childcare | Do not allow babies or children to swim in public swimming pools or school swimming lessons until 2 weeks after diarrhoea and vomiting stop | Schools and childcare settings |
| PWTAG, Code of Practice (July 2021, updated July 2025) | The foreword says the HSE and local authorities treat PWTAG guidance as the standard for effectively managed swimming pools. The contents cover pre-swim hygiene, babies and young children, showers and faecal fouling | Public pools. The code describes itself as a summary for swimming pools for public use |
In September 2026 UKHSA said residents can help reduce opportunities for mosquitoes to breed by removing standing water from gardens, including water that collects in paddling pools. In the sources we read, we found no UK official figure for how often to change the water. Our guide to leaving water in a paddling pool covers that question.
Why might your paddling pool water not be as clean as it looks?
Because clear water tells you nothing about what has been swallowed, splashed in or collected, and nothing in the sources we read gives a figure for a home pool. A figure for the area's tap water does not describe your pool, which holds whatever came out of your tap plus everything that has gone in since. The sources point to a few reasons.
- UKHSA says the parasite Cryptosporidium may contaminate swimming pools, and that people can pass it in their faeces for several weeks even after symptoms end.
- UKHSA says to avoid swallowing water in swimming pools.
- RoSPA says rainfall can refill a paddling pool, and UKHSA names water that collects in paddling pools among the standing water residents can remove to reduce opportunities for mosquitoes to breed.
None of that is a measurement of your water, and a figure for the area does not tell you what is in your own pool. If you are worried about your health or your child's, UKHSA says to contact your GP.
“A figure for the area tells you about the tap water in general, not what is sitting in your own pool, which holds whatever came out of your tap plus everything that has gone in since. If you want to know what your fill water and pool actually read, checking them yourself is a sensible step.”
What should you use to keep paddling pool water clean?
In the sources we read, we found no UK official list of products or doses for a home paddling pool, so follow the instructions that come with your pool and any product. We give no dosing or mixing instructions. PWTAG's public pool ranges are in our cloudy pool and hot tub water guide, and are not a home standard. A 20-in-1 strip is one way to see what your own water reads, as explained in how to test your water at home.
Why does paddling pool water go green?
We found no UK official advice on green water in a home paddling pool in the sources we read. Our green pool water guide covers pools more widely.
What can a test strip tell me about paddling pool water?
It indicates chlorine, pH and alkalinity bands, in the pool or in the tap you fill it from. Fill a clean glass or cup, dip one strip, wait 30 to 60 seconds and match the pads to the chart, or enter the colours in the free results checker. We have not run strips on paddling pools, and the last column is our own reading of the chart steps.
| Check | UK official range for a home paddling pool (in the sources we read) | Our strip chart |
|---|---|---|
| Free chlorine | We found none | Steps at 0, 0.5, 1, 3, 5, 10 and 20 mg/L. It indicates whether free chlorine is present at the 0.5 mg/L step or above |
| pH | We found none. Raising or lowering pool pH has public pool and hot tub ranges | Steps at 6.2, 6.8, 7.2, 7.6, 7.8 and 8.4. We give no verdict on a reading |
| Total alkalinity | We found none | Steps at 0, 40, 80, 120, 180 and 240 mg/L |
Two things are outside what the kit can do.
- No pad responds to algae, Cryptosporidium or other germs, and clarity is judged by eye.
- We do not claim the rapid bacteria test for paddling pool water. It is a coliform presence screen for drinking water samples, such as tap or private supply water, read after 24 to 48 hours.
Any figure for your area is an average for tap water in general, and your pool holds whatever came out of your tap plus everything added since, including rain, which RoSPA says can refill a paddling pool. The pads that matter here are free chlorine, pH and total alkalinity, and a difference between the reading at your fill tap and the reading in the pool would indicate that the water has changed since it left the tap. Best pack: 20 strips, enough for 10 checks of both your fill tap and your pool (our arithmetic), £5.99 (or £10.99 with a bacteria test for the tap water), with free 2nd Class delivery on every order. See the kit
Your paddling pool questions
How to keep paddling pool water clean? How to keep a paddling pool water clean? How to keep water in paddling pool clean? How to keep paddling pool water fresh?
In the sources we read, we found no UK official routine. RoSPA says to empty paddling pools straight after use, the NHS and UKHSA say to stay out of swimming pools while ill and for a set time afterwards, and UKHSA says removing standing water, including in paddling pools, helps reduce opportunities for mosquitoes to breed.
How to keep paddling pool water clean naturally?
In the sources we read, we found no UK official guidance on natural methods. The sources name emptying after use and keeping anyone with diarrhoea out of swimming pools.
How to stop paddling pool water going green?
We found no UK official advice for a home paddling pool in the sources we read. Our green pool water guide has more.
How to clean paddling pool water?
In the sources we read, we found no UK official method for a home paddling pool. RoSPA's advice is to empty it straight after use, and PWTAG's code covers faecal fouling for public pools, not home ones.
How to warm paddling pool water? How to warm up paddling pool water? How to heat up paddling pool water?
In the sources we read, we found no UK official guidance on warming a paddling pool, and we give no heating instructions.
Sources
- Royal Society for the Prevention of Accidents, Garden safety (supervision, emptying paddling pools, rain refilling them; undated page; read 29 October 2026).
- NHS, Diarrhoea and vomiting (swimming pool and 48 hours; last reviewed 21 December 2023, next review due 21 December 2026; read 29 October 2026).
- UK Health Security Agency, Cryptosporidium: public advice (1 November 2023; swimming pools and splash pads, 2 weeks, swallowing water, faeces for several weeks, GP; read 29 October 2026) and Specific settings and populations: additional health protection considerations in children and young people's settings (undated page; water-based activities, 2 weeks after diarrhoea and vomiting; read 29 October 2026).
- UK Health Security Agency, Invasive mosquito species detected in east London (3 September 2026; removing standing water, including in paddling pools; read 29 October 2026).
- Pool Water Treatment Advisory Group, Code of Practice: The management and treatment of swimming pool water (July 2021, updated July 2025; foreword and contents only; we read only the opening pages of this document; read 29 October 2026).
- WaterKit, Water Test Kit (20-in-1 strip, 30 to 60 second read, optional rapid coliform test read after 24 to 48 hours, strips from £3.99, free 2nd Class delivery on every order) and results checker. The strip-chart column is WaterKit's own reading of the colour chart steps.
Contains public sector information licensed under the Open Government Licence v3.0.