Calculate how much chlorine to add to your pool. Enter current and target free chlorine levels to get exact dosage in oz or lbs for liquid, granular, or tablet chlorine.
Enter your current and target free chlorine levels to calculate the required dose. The ideal free chlorine range is 1-3 ppm (or 2-4 ppm if your CYA is 30-50 ppm).
Liquid chlorine (sodium hypochlorite 10-12%) acts fast but has a short shelf life. Granular chlorine provides more precise dosing and longer storage.
Chlorine degrades quickly in direct sunlight and high temperatures. Using CYA stabilizer (30-50 ppm) can significantly reduce chlorine consumption.
The ideal free chlorine (FC) level for a residential pool is 1-3 ppm. If you use CYA stabilizer (30-50 ppm), maintain FC at 2-4 ppm. Salt water pools typically target 1-3 ppm FC.
Most pools need chlorine added every 1-3 days depending on usage, sunlight exposure, and temperature. Test your water at least 2-3 times per week during swimming season to maintain proper levels.
Liquid chlorine (sodium hypochlorite, 10-12.5%) acts quickly but has a shorter shelf life. Granular chlorine (calcium hypochlorite, 65-68%) is more concentrated and has a longer shelf life. Trichlor tablets are slow-dissolving and contain CYA stabilizer.
Chlorine degrades rapidly in direct sunlight (UV rays). Without CYA stabilizer, chlorine can be depleted within hours on a sunny day. Maintaining 30-50 ppm CYA can reduce chlorine consumption by up to 50%. High temperatures and heavy bather load also accelerate chlorine consumption.
Yes. Chlorine levels above 5 ppm can cause eye and skin irritation and may damage pool equipment. If you accidentally over-chlorinate, allow the pool to sit in sunlight (which degrades chlorine) or use a chlorine neutralizer (sodium thiosulfate).