Symptoms
- Water looks hazy or milky
- Foam builds up on the surface, especially with jets running
- Water has an odd smell alongside the cloudiness
Likely causes
- CommonLow sanitizer (chlorine or bromine) levelInsufficient sanitizer lets organic material cloud the water quickly given the small volume and high usage.
- CommonBody oils, lotions, and soap residue from bathersThese substances are a major contributor to foam and cloudiness in a hot tub's small water volume.
- CommonDirty or worn out filter cartridgeA clogged filter can't remove fine particles causing haze.
- PossibleHigh total dissolved solids from infrequent water changesHot tub water should be fully drained and refilled every 3–4 months typically.
What to do
- Test and adjust sanitizer levels to the manufacturer's recommended range.
- Clean the filter cartridge thoroughly, or replace it if it's more than a year old or visibly worn.
- Shock the water with the appropriate non-chlorine or chlorine shock product to break down organic contaminants.
- Use an anti-foam product for immediate foam relief while addressing the underlying cause.
- Encourage bathers to rinse off before entering to reduce oils and lotions entering the water.
- If water is old or heavily used, consider a full drain and refill rather than continuing to chase chemical balance.
Tools and parts
- Hot tub test strips
- Filter cleaning supplies
Hot tub shock treatmentSearch: “hot tub shock non chlorine”
Hot tub anti-foam solutionSearch: “hot tub defoamer anti foam”
When to call a pro
A spa service company can perform a full drain, clean, and refill if water chemistry issues persist despite regular maintenance.
Safety
Use caution
Avoid using the hot tub while chemical levels are being corrected until they're back in the safe range.