Symptoms
Green water, cloudy water, foam, a strong smell… Find your symptom, understand the cause and follow the right treatment, step by step.
Brown or rusty pool water
Brown, rusty or tea-coloured water after a refill points to iron or manganese. Whatever you do, don'…
→Cloudy pool water
Cloudy water comes from insufficient filtration, unbalanced chemistry or early-stage algae. How to i…
→Foamy pool or hot tub water
Persistent foam on the surface of a pool or hot tub comes from organic residues (cosmetics, laundry …
→Green pool water
Green pool water is almost always algae. Here's why it happened and how to get back to crystal-clear…
→Milky or white pool water
Milky, whitish water comes from a limescale/pH/alkalinity imbalance, an overwhelmed filter or the af…
→Mustard algae
A yellow-beige deposit that keeps returning to the same spot despite brushing? That's mustard algae,…
→Pool smells strongly of chlorine
A strong chlorine smell doesn't mean too much chlorine: it's chloramines, the sign that active chlor…
→Stinging eyes at the pool
Red eyes and itchy skin after a swim? The cause is a drifting pH or chloramines — rarely "too much c…
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