Pool Maintenance Guide: Chemistry, Equipment, and Annual Costs

The 3 Essential Pool Parameters

pH (7.2–7.8): Most critical parameter. Low pH corrodes equipment and irritates swimmers. High pH reduces chlorine effectiveness. Test 2–3× per week. Adjust with muriatic acid (lower) or sodium carbonate (raise).
Free chlorine (1–3 ppm): The sanitizer that kills bacteria and algae. Maintain consistently — gaps allow algae blooms that cost $200–500+ to treat. Tablets, liquid, salt generator.
Total alkalinity (80–120 ppm): Stabilizes pH. Low alkalinity causes pH to swing wildly. Adjust with sodium bicarbonate (raise) or muriatic acid (lower).

Annual Pool Costs

Chemicals: $400–800/year for an average 15,000-gallon pool
Electricity (pump/filter): $600–1,200/year (variable speed pumps save $400–600/year vs. single speed)
Water (refilling evaporation): $200–400/year
Equipment maintenance/repairs: $200–500/year average
Professional service (weekly): $100–200/month ($1,200–2,400/year)
Total annual ownership cost: ~$2,000–5,000+ depending on service level

Preventing the #1 Problem: Algae

Green algae blooms happen fast — a pool can turn green in 24–48 hours in warm weather if chlorine drops below 1 ppm. Prevention is far cheaper than treatment. Weekly brushing (brushes algae spores off walls before they take hold), consistent chlorine levels, and running the filter 8–12 hours per day in summer are the essentials.

Frequently Asked Questions

How often should I test pool water?

During swimming season: 2–3 times per week minimum. After heavy rain, large parties, or very hot weather: test the same day. Imbalanced water damages equipment (especially with low pH), irritates swimmers, and allows algae growth. Inexpensive test strips or a liquid test kit handle this in 2 minutes.

Is a saltwater pool better than chlorine?

Saltwater pools generate chlorine from salt via electrolysis — they still use chlorine, just generate it on-site. Benefits: lower ongoing chemical costs, softer-feeling water, less chlorine smell (it's actually chloramines that smell, not chlorine). Higher upfront cost (salt cell: $500–1,200, replaced every 3–5 years). Overall comparable cost over time with convenience advantage.