Check₂O Pool & Spa Free Chlorine
Check₂O Pool & Spa Free Chlorine
0 - 1 - 2 - 3 - 5 - 10 mg/L OCl-
Swimming pools are disinfected with chlorine in the form of either hypochlorite or di/trichloroisocyanurate. This keeps the water free from microorganisms. The optimum chlorine levels are dependent on which material has been used. If hypochlorite is used, a level of 3ppm should not be exceeded, whereas with chloroisocyanurates a level of 5ppm should not be exceeded. The pH of the swimming pool is also, an important factor to consider when dosing any pool. The higher the pH, the less effective the chlorine will be for disinfection purposes. The ideal pH for free chlorine disinfection is between pH 7.0 and pH 7.4.
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.