Wellis Crystal pH Down (1 L)
What it does
High pH (above 7.8) reduces chlorine effectiveness, causes scale on acrylic and equipment, and can irritate skin and eyes. Crystal pH Down brings pH back to neutral.
When to use
- After a 5-in-1 test shows pH above 7.6
- After fresh fill if your tap water is alkaline
- After heavy bather load (high usage pushes pH up)
How to use
- Test water with Crystal Pool Check 5-in-1 strips — confirm pH is above 7.6.
- Turn the spa circulation pump ON.
- Add the dose printed on the bottle (per 1 m³ of water) directly to the spa, away from the skimmer intake.
- Run circulation for 15 minutes.
- Wait 2 hours, then retest.
- Repeat if pH is still high — never over-dose.
⚠ Important — please read before use: Always follow the dosing instructions printed on the product label and on the Safety Data Sheet (SDS) supplied with the chemical. Consult your Wellis spa user manual for product-specific water-care guidance applicable to your model, water source, and usage pattern. Never mix water-care chemicals together directly — always add each product separately to circulating spa water with the pump running. The information on this page is provided as general guidance only and does not replace the manufacturer's instructions or professional advice. TwoRelax accepts no liability for damage, injury, water-quality issues, or equipment failure resulting from incorrect use, improper dosing, mixing of incompatible products, or failure to follow the manufacturer's instructions.