Wellis Crystal Water Treatment Set (Chlorine-Free)
What it does
Active oxygen kills bacteria and oxidises organic contaminants without leaving a chlorine residue. The system requires three components used together: this base treatment, the Active Oxygen Activator, and the Active Oxygen Granules.
When to use
- For users sensitive to chlorine smell or who report skin irritation.
- For households with young children where chlorine exposure is a concern.
- NOT for spas equipped with the in.Clear bromine generator (use Bromine Salt instead).
How to use
- Fresh fill, balance alkalinity and pH first.
- Add Crystal Water Treatment per package instructions.
- Activate weekly using the Active Oxygen Activator and Granules (sold separately).
- Test 2–3× per week with Crystal Pool Check 5-in-1 strips.
- Refresh the active oxygen weekly with the activator + granules cycle.
⚠ 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.