How much does pool maintenance cost?

DIY: $1,000-$2,000 per year (chemicals $500-$1,000, filter media and parts $100-$300, equipment wear $200-$500, opening/closing supplies $100-$200). Professional weekly service: $100-$300/month ($1,200-$3,600/year). Professional opening and closing: $300-$800/year combined. Total professional: $2,000-$5,000/year. DIY saves 40-60%. The biggest ongoing expense: chlorine and chemicals ($500-$1,000/year). The biggest single expense: pump or heater replacement ($500-$3,000 when needed, every 8-15 years).

How often should I test pool water?

During swimming season: 2-3 times per week (pH, free chlorine, total alkalinity). During heavy use or hot weather: daily. After rain: test immediately (rain dilutes chemicals and changes pH). Weekly: test CYA (cyanuric acid) and calcium hardness. Monthly: take a water sample to a pool store for a comprehensive test (they test for metals, phosphates, TDS, and other parameters that home kits do not measure). The most important test: free chlorine — if chlorine drops below 1 ppm, bacteria and algae can grow within hours in warm water.

What causes cloudy pool water?

The most common causes: 1) Low chlorine (below 1 ppm) — algae or bacteria growth. Fix: shock the pool (add 3-5x the normal chlorine dose). 2) High pH (above 7.8) — causes calcium to come out of solution. Fix: add muriatic acid to lower pH to 7.2-7.4. 3) Dirty or exhausted filter — the filter cannot remove particles. Fix: backwash (sand/DE) or clean cartridges. 4) High calcium hardness (above 400 ppm) — calcium precipitates into the water. Fix: partially drain and refill with fresh water. 5) Algae (early stage) — green tint plus cloudiness. Fix: shock heavily (3-5 lbs per 10,000 gallons), brush walls, and run filter 24 hours. For persistent cloudiness: add a pool clarifier (coagulates fine particles so the filter can capture them).

How long should I run my pool pump each day?

8-12 hours per day during swimming season. The goal: turn over the entire pool volume at least once per day (one turnover). Calculate: pool volume (gallons) ÷ pump flow rate (gallons per hour) = hours needed for one turnover. Example: 15,000-gallon pool ÷ 2,500 GPH pump = 6 hours per turnover. Most experts recommend at least 8 hours per day (some turnover overlap is good). During heavy use or algae treatment: run 24 hours. To save energy: run the pump during off-peak electricity hours (overnight in many areas). Variable-speed pumps: run at low speed for longer hours (more efficient and quieter than running a single-speed pump at full power for fewer hours). Energy savings with a variable-speed pump: 50-75% compared to a single-speed pump.

Article

Outdoor Living

Pool Maintenance Guide: Chemicals, Schedule & Cost

Lumberama Editorial Team, Pool Care & Maintenance Specialists Jul 4, 2026 13 min read

Water Chemistry Basics

Balanced water chemistry is the foundation of pool maintenance. The three most important measurements:

pH (7.2-7.6): Measures acidity/alkalinity. Low pH (below 7.2) is acidic — corrodes equipment, irritates skin and eyes, and dissolves plaster. High pH (above 7.6) is alkaline — causes cloudy water, scale buildup, and reduces chlorine effectiveness. To lower pH: add muriatic acid or sodium bisulfate (dry acid). To raise pH: add sodium carbonate (soda ash).

Free chlorine (1-3 ppm): The sanitizer that kills bacteria, algae, and pathogens. Below 1 ppm: insufficient sanitization (health risk). Above 5 ppm: skin and eye irritation. Add chlorine via tablets (slow-dissolving, in a floater or automatic chlorinator), liquid chlorine (pool-grade sodium hypochlorite), or granular shock.

Total alkalinity (80-120 ppm): Buffers the pH to prevent rapid swings. Low TA causes pH bounce. High TA makes pH hard to adjust. To raise: add sodium bicarbonate (baking soda). To lower: add muriatic acid.

Other important levels: Cyanuric acid (CYA, 30-50 ppm): stabilizer that protects chlorine from UV degradation. Essential for outdoor pools. Calcium hardness (200-400 ppm): prevents water from corroding plaster and equipment (too low) or depositing scale (too high).

Weekly Maintenance

Test the water: Use test strips or a liquid test kit (Taylor K-2006 is the gold standard) to check pH, free chlorine, and total alkalinity. Test 2-3 times per week during swimming season. Adjust chemicals as needed.

Skim and brush: Skim the surface with a leaf net daily or every other day. Brush the walls and floor weekly (prevents algae from establishing).

Vacuum: Vacuum the pool floor weekly (manual vacuum or automatic pool cleaner).

Empty skimmer and pump baskets: Check and empty weekly (a full basket reduces pump efficiency).

Check the filter pressure gauge: Clean or backwash the filter when the pressure rises 8-10 PSI above the clean starting pressure.

Filter Types

Sand filter: Water passes through a bed of special filter sand. Filters particles down to 20-40 microns. Requires backwashing when pressure rises. Replace sand every 5-7 years. Lowest maintenance. Cost: $200-$600.

Cartridge filter: Water passes through a pleated polyester cartridge. Filters particles down to 10-15 microns (better than sand). Remove and hose off cartridges when pressure rises. Replace cartridges every 1-3 years ($50-$150 per cartridge). No backwashing (saves water). Cost: $200-$500.

DE (diatomaceous earth) filter: Uses DE powder coated on grids. Filters particles down to 3-5 microns (the finest filtration). Produces the clearest water. Requires backwashing and recharging with DE powder. More maintenance than sand or cartridge. Cost: $300-$800.

Opening and Closing

Opening (spring): Remove the cover. Clean and reinstall ladders, rails, and accessories. Reconnect the pump and filter. Fill the pool to the proper level. Run the pump and check for leaks. Shock the pool (super-chlorinate with 3-5x the normal chlorine dose). Balance the water chemistry. Run the pump 24 hours for the first few days.

Closing (fall): Balance the water chemistry. Shock the pool. Add winterizing chemicals (algaecide and stain preventer). Lower the water level below the skimmer (for mesh covers) or to the bottom of the tile line. Blow out the plumbing lines with a shop vac or compressor. Add antifreeze to the lines. Install the winter cover.