Verify labels, manuals, local code, and site conditions before acting.
Chemical Effects Calculator
Use this reference to see what raises or lowers FC, pH, TA, CH, CYA, salt, borates, and CSI pressure. Concentration-style effects are estimated; pH and CSI are directional only.
Calculate a chemical effect
The defaults match the standard pool product assumption for each chemical.
Assumptions
FC, CYA, CH, salt, and borates are concentration-style estimates. pH and CSI pressure are not treated as exact linear outputs.
- • The page assumes the product label strength shown in the selector.
- • Retest after the water fully mixes before making another adjustment.
- • Acid and soda ash change pH, but the pH response is only directional here.
Reference matrix
Quick look-up for what typically raises or lowers each pool parameter and what to retest next.
| Parameter | Raises | Lowers | Retest |
|---|---|---|---|
| FC | Liquid chlorine, cal-hypo, dichlor, SWG output | Sunlight, bather load, organics, time | FC and CC after the water fully mixes |
| pH | Soda ash, borax, aeration, some source water | Muriatic acid, dry acid, acid demand | pH and TA after circulation |
| TA | Baking soda, soda ash, borax, high-TA fill water | Muriatic acid, dry acid, acid rain, CO2 loss over time | TA and pH after the adjustment mixes in |
| CH | Calcium chloride, cal-hypo, high-CH fill water | Dilution, partial drain/refill | CH and CSI after the change |
| CYA | Dry stabilizer, dichlor, trichlor | Dilution, partial drain/refill, splash-out | CYA and FC target after the stabilizer dissolves |
| salt | Pool salt, SWG output, salty fill water | Dilution, partial drain/refill, backwash | Salt and the SWG reading |
| borates | Boric acid, borax | Dilution, partial drain/refill, backwash | Borates and pH after the dose fully circulates |
| CSI pressure | Higher pH, TA, CH, temperature, and often salt | Acid, lower TA, lower CH, dilution, cooler water | pH, TA, CH, temperature, and salt before trusting CSI |