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Backyard Swimming Pool Opening and Water Chemistry Planner for Homeowners: Volume Math, Spring Startup Steps, Free Chlorine to CYA Ratio, pH and Total Alkalinity Targets, Liquid Chlorine Dosing, Green Pool SLAM Plan, and a Weekly Test Log
Open a residential pool after winter with a plan instead of guesses: gallons from the pool's real dimensions, cover removal and equipment startup in order, test results read against target ranges, chlorine dosing math for the liquid chlorine you buy, a step by step plan to clear green water, chemical safety rules, and a weekly testing routine for the season.
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Prompt
Act as a residential pool service technician who opens backyard pools every spring, doses by the numbers from a drop based test kit, and teaches homeowners to keep the water clear on their own. Inputs: - Pool shape, length, width, shallow and deep end depths, surface (plaster, vinyl, fiberglass), and cover type: [PoolSpecs] - Equipment: pump, filter type (sand, cartridge, DE), heater, salt cell or chlorinator: [Equipment] - Current water: color and clarity, and test results for free chlorine, combined chlorine, pH, total alkalinity, calcium hardness, and cyanuric acid: [WaterTest] - Chemicals on hand or easy to buy, with strength (liquid chlorine percentage, muriatic acid strength, baking soda, stabilizer): [ChemicalsOnHand] - Opening date target, how often you can test, and who will swim (kids, pets): [SeasonPlan] - Output format: [Format] Generate: 1. Volume in gallons from PoolSpecs: length x width x average depth x 7.48 for rectangles (adjust for ovals and rounds), with the arithmetic shown. 2. Opening sequence in order: clear and remove the cover, refill to mid skimmer, reinstall plugs, baskets, and ladders, prime and start the pump, check the filter pressure, and inspect for leaks before adding chemicals. 3. A test results table: each value in WaterTest against the target range for this surface and sanitizer, and the action needed. Base the free chlorine target and shock level on the cyanuric acid level using the FC to CYA chart the owner follows, and say which chart. 4. Dose math for each action using ChemicalsOnHand and the volume: for example, 1 gallon of 12.5% liquid chlorine raises free chlorine about 12.5 ppm in 10,000 gallons, scaled to this pool. For pH and alkalinity changes, give the calculator method and tell the owner to add acid in portions and retest. 5. If the water is green or cloudy, a SLAM plan: hold free chlorine at the shock level from the chart, test and redose several times a day, brush daily, run the pump around the clock, and stop only when overnight chlorine loss is 1 ppm or less, combined chlorine is 0.5 or less, and the water is clear. 6. Filter care during cleanup by filter type: when to backwash or clean cartridges based on pressure rise. 7. Safety rules: never mix chlorine and acid, add chemicals to water, one chemical at a time with the pump running, wear goggles and gloves, store chemicals apart, and keep swimmers out until chlorine is back in the normal range. 8. A weekly log template: date, FC, pH, TA, CH, CYA (monthly), chemicals added, water clarity, and notes. Constraints: - Use only numbers from WaterTest and stated product strengths; mark anything else "check your test kit or product label". - Short steps, no em dashes.
Instructions
Replace every [bracket] with your details before running. Works on ChatGPT, Claude, and Gemini.
Generated Output
This image was generated using the prompt above.
Examples
Example Input
PoolSpecs: in ground rectangle, 16 by 32 feet, 3.5 feet shallow to 7.5 feet deep, white plaster, solid winter cover Equipment: 1.5 hp single speed pump, sand filter, no heater, tablet chlorinator WaterTest: light green and cloudy; FC 0, CC 0.5, pH 7.9, TA 120, CH 300, CYA 40 ChemicalsOnHand: 12.5% liquid chlorine, 31.45% muriatic acid, baking soda SeasonPlan: want to swim Memorial Day weekend, can test morning and evening, two kids and a dog Format: volume, steps, table, dosing, SLAM, log
Example Output
1) VOLUME Average depth: (3.5 + 7.5) / 2 = 5.5 ft 16 x 32 x 5.5 = 2,816 cubic feet 2,816 x 7.48 = about 21,064 gallons. Use 21,000. 2) OPENING SEQUENCE 1. Pump water and leaves off the solid cover, then remove, clean, and dry it before storing. 2. Fill to the middle of the skimmer opening. 3. Remove winter plugs, reinstall skimmer baskets, return eyeballs, ladder, and rails. 4. Set the sand filter valve to filter, prime the pump, and start it. Note the clean pressure reading. 5. Walk the equipment for drips for 15 minutes before adding any chemicals. 3) TEST TABLE (chart used: FC to CYA chart from TFP) | Test | Now | Target | Action | | FC | 0 | 3 to 5 at CYA 40; shock 16 | SLAM | | CC | 0.5 | 0 | clears during SLAM | | pH | 7.9 | 7.4 to 7.6 | lower with acid first | | TA | 120 | 70 to 90 for plaster with tablets | lower slowly with acid and aeration | | CH | 300 | 250 to 350 | none | | CYA | 40 | 30 to 50 | none; tablets will raise it, recheck monthly | 4) DOSING Chlorine: 1 gallon of 12.5% raises 10,000 gallons about 12.5 ppm, so in 21,000 gallons 1 gallon raises about 6 ppm. From 0 to 16 ppm: 16 / 6 = about 2.7 gallons. Pour it in front of a return with the pump running. Acid: enter pH 7.9 to 7.5, TA 120, and 21,000 gallons into a pool calculator using 31.45% muriatic acid. Add it in two portions 30 minutes apart, pour slowly along the deep end, and retest pH before the second portion. Order: acid first, wait at least 30 minutes, then chlorine. Never together. 5) SLAM PLAN - Hold FC at 16 ppm. Test morning, midday, and evening; redose back to 16 each time. - Brush walls and floor daily. Run the pump 24 hours a day. - Done when: overnight FC loss is 1 ppm or less, CC is 0.5 or less, and you can see the main drain clearly. - Then let FC fall to 3 to 5 and restart tablets. 6) FILTER Backwash when pressure is 8 to 10 psi above the clean reading; expect to do it daily for the first few days of cleanup. 7) SAFETY - Never mix acid and chlorine or pour them into the same bucket. - Always add chemicals to water, one at a time, pump running. - Goggles and gloves on. Store acid and chlorine on opposite sides of the shed. - Kids and the dog stay out until FC is back to 3 to 5 and the water is clear. Keep the gate latched during SLAM. 8) WEEKLY LOG | Date | FC | pH | TA | CH | CYA | Added | Clarity | Notes | | May 10 | 16 | 7.5 | 110 | 300 | 40 | 2.7 gal chlorine, acid | cloudy | SLAM day 1 | Target: clear water and FC 3 to 5 by May 20 for Memorial Day weekend.