Bring soft hot tub and pool water back up to strength with food-grade calcium chloride flakes. When hardness slips under 150 ppm the water turns aggressive and foamy. A single dose returns it to the safe 150-250 ppm range.
Available in 1kg, 2.5kg, 5kg, 10kg, 20kg, 25kg.
Keep hot tubs at 150 ppm to 250 ppm and swimming pools at 200-400 ppm.
Roughly 10 ppm across 1000 L of water at room temperature.
Yes, provided you dissolve it in a bucket first and add it with the pump running. Never scatter dry flakes across an acrylic shell.
A 1500 L hot tub uses about 25-50 g per top-up, so 1 kg gives you 20-40 doses, near enough a year of normal use.
Yes. Calcium chloride works alongside salt chlorination and does not affect the cell.
No. This is a balancer rather than a sanitiser, so your sanitiser levels stay where they are.
Flakes carry more surface area, so they dissolve faster and are far less likely to settle and pool on the shell.
Yes. Every 100 ppm of added hardness raises TDS by around 280 ppm, so refresh some water if TDS climbs above 1500 ppm.
Calcium is one of the four LSI factors, alongside pH, alkalinity and temperature. Raising it steers water away from the corrosive end of the index.
Either the flakes went in neat or pH was already above 7.8. Circulate for 24 hours, add a clarifier, and lower pH if you need to.
No. Scale is the reverse issue; use Water Scale Inhibitor and drop pH to dissolve existing deposits.
Foam that has nothing to do with softness usually comes from lotions, detergents or a poor antifoam. Clean the filter and use an antifoam made for hot tubs.
Calcium chloride only raises hardness, whereas calcium hypochlorite is a powerful sanitiser that also lifts pH and chlorine. The two are not interchangeable.
Both share the same active ingredient. Flakes dissolve quicker; prills are denser and simpler to scoop. Zagosa Spa & Pool supplies flakes so they melt away fastest in heated water.