Enter your readings and pool size. Get exactly how much chlorine, acid, bicarb, calcium or stabilizer to add, in pounds and quarts.
Enter the pool's volume and your test readings. The calculator compares each reading to its target range and tells you which product to add and how much, in pounds for dry chemicals and quarts for liquids, with ounces alongside. Amounts are exact, not rounded to the nearest jug, so a 6,000-gallon pool gets the right dose too.
| Reading | Target used | Product |
|---|---|---|
| Free chlorine | 7.5% of CYA, at least 2 ppm (3 ppm with no CYA) | Trichlor tabs or 12% liquid chlorine |
| pH | 7.2 to 7.8 (aim 7.6 when lowering) | 31% muriatic acid; aeration to raise |
| Total alkalinity | 80 to 120 ppm | Sodium bicarbonate |
| Calcium hardness | 200 ppm minimum | Calcium chloride |
| Cyanuric acid | 30 to 50 ppm | Conditioner; dilution to lower |
Every dose scales with gallons. A pool guessed at 20,000 gallons that is really 14,000 gets 40% too much of everything. For a rectangle, length × width × average depth × 7.5 gives gallons; for an oval or kidney, use about 5.9 instead of 7.5.
On a route, the dose is only half the job; the other half is knowing what was added, where, and who pays for it. RouteSplash suggests the dose at the pool, logs what the tech actually added, can bill those chemicals to the customer at your price-book price, and compares what left the truck with what was logged. Check the water balance with the LSI calculator.
About 12.8 fluid ounces of 12% liquid chlorine raises free chlorine 1 ppm in 10,000 gallons. That is 0.4 quarts per ppm per 10,000 gallons; the calculator scales it to your volume and target.
Roughly 7 fluid ounces of 31% muriatic acid per 10,000 gallons drops pH about 0.1 when total alkalinity is 100 ppm; higher alkalinity needs proportionally more. Add half, circulate, and retest after 20 minutes.
A common rule is free chlorine of at least 7.5% of the CYA level, and never below 2 ppm. At 40 ppm CYA that is 3 ppm; at 80 ppm CYA it is 6 ppm.
Those are the units pool techs actually measure on the truck. Every amount also shows ounces, and nothing is rounded, so small pools get an exact dose.
Pool service software built by a working pool company: day sheets, water chemistry with LSI and dosing, chemical billing, AutoPay, profit by route. $49 a month (Starter) up to 50 pools, then $59 + $30/login + $0.25/pool, then $0.75/pool past 150. Try it free for 30 days.
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