Pool maintenance: the complete guide
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Maintaining a pool comes down to four things: keep the water moving, keep it filtered, keep it clean, and keep the chemistry balanced. Get those right on a regular schedule and problems mostly stop happening. Here is the whole routine, the numbers to hit, and the exact doses when something is off.
What pool maintenance actually involves
Almost every pool problem traces back to one of four things being neglected, and they build on each other, no amount of chlorine fixes a pool that never circulates.
Circulation
Water that sits still grows algae. The industry recommendation, as Pentair’s guide gives it, is to turn the whole pool over every six hours, four times a day. Hayward says 8 hours of pump time is enough for an average pool, and Pentair suggests starting at 12 and adjusting.
Filtration
The filter physically removes what chemistry cannot. Clean or backwash it when pressure rises about 25% above its clean baseline, not on a fixed date.
Cleaning
Skim, brush, and vacuum weekly. Brushing matters more than people think: it dislodges the biofilm algae needs to take hold, especially on steps and shaded walls.
Chemistry
Test weekly, dose to the target, re-test. Sanitizer keeps the water safe; pH, alkalinity, and calcium keep it from destroying your surfaces and equipment.
Pool maintenance schedule
A realistic routine for a residential pool in season. Sun-belt pools running year-round follow the same cadence with a lighter winter. The CDC recommends testing chlorine and pH at least twice a day, and more often when many people use the water. The weekly and monthly testing below follows the schedule in Hayward’s manual, so treat it as the minimum.
| Task | How often | Why it matters |
|---|---|---|
| Test free chlorine and pH | At least weekly, more in heat or heavy use (the CDC says twice a day) | The two that move fastest and cause the most damage when wrong |
| Skim surface, empty skimmer and pump baskets | Weekly | Debris that sinks becomes chlorine demand and stains |
| Brush walls, steps, and shaded corners | Weekly | Breaks up biofilm before it becomes an algae bloom |
| Vacuum the floor | Weekly | Removes what settles out of reach of the skimmer |
| Dose chemicals to your test results | Weekly | Small corrections beat big rescues |
| Check filter pressure and water level | Weekly | Keeps the pump primed and the filter working |
| Test alkalinity, CYA, calcium, and salt | Monthly | Slow-moving numbers that quietly drift out of range |
| Clean or backwash the filter | When pressure is about 25% over clean | Pressure, not the calendar, tells you when |
| Inspect the salt cell for scale | Every 2-3 months | Scale on the plates kills chlorine output |
| Deep-clean the filter (chemical soak) | Once or twice a season | Removes oils and scale a rinse cannot |
| Open the pool for the season | Spring | Early opening prevents the algae bloom warm water invites |
| Close and winterize | Fall, once water is under 60°F / 15°C | Prevents freeze damage to plumbing and equipment |
Ideal pool water levels chart
The targets every weekly test is aiming at. Free chlorine is the one people get wrong most often. It is not a fixed number, it scales with your stabilizer.
| Level | Ideal range | Notes |
|---|---|---|
| Free chlorine (FC) | At least 7.5% of your CYA | Target 5-7 ppm at CYA 40, 9-11 ppm at CYA 80 (Trouble Free Pool chart) |
| pH | 7.2-7.8 | Hayward and Pentair manuals; the app aims for 7.5 |
| Total alkalinity (TA) | 80-120 ppm | Hayward and Pentair manuals, salt pools included |
| Cyanuric acid (CYA) | 30-50 ppm | Hayward and Pentair manuals, salt pools included |
| Calcium hardness (CH) | 200-400 ppm plaster | 80-200 ppm vinyl and fiberglass (MAHC Annex) |
| Salt | 2,700-3,400 ppm (Hayward) or 3,600-4,500 (Pentair) | Salt pools only. Follow your cell's manual; the app asks which cell you have |
| Combined chlorine (CC) | 0.5 ppm or less | Above that, shock (Trouble Free Pool) |
| LSI (water balance) | −0.3 to +0.3 | Negative etches surfaces, positive scales them |
The weekly routine, start to finish
Test first, before you touch anything, so you are dosing to real numbers. Skim the surface and empty the baskets, brush the walls and steps, then vacuum. Add chemicals in the order that works with the water rather than against it: alkalinity, then pH, then calcium, then stabilizer and salt, and chlorine last. Add one thing at a time with the pump running, and re-test before adding more. The whole loop is fifteen or twenty minutes once it is a habit.
Add chemicals in the right order
Order matters because each adjustment moves the next reading. Alkalinity buffers pH, so setting it first stops pH bouncing while you chase it. Acid lowers both pH and alkalinity at once. Calcium and stabilizer dissolve slowly and should settle before you judge the result. Never mix chemicals in a bucket, and never add acid and chlorine together, concentrated, they produce toxic chlorine gas.
Monthly and seasonal work
Once a month, test the slow movers: alkalinity, cyanuric acid, calcium hardness, and salt if you run a generator. These drift quietly and are what turn a well-run pool cloudy in August. Once or twice a season, deep-clean the filter with a proper chemical soak rather than a hose rinse. In spring, open early, algae takes off when water warms, so beating it there is far easier than fighting it later. In fall, close once the water is consistently under 60°F (15°C).
What pool maintenance costs to do yourself
Your yearly costs are chemicals, filter media, and eventually the salt cell: Pentair designs its IntelliChlor cell for about 10,000 hours, roughly five years of average use, and Hayward gives its AquaRite a four-year warranty. A weekly pool service is a monthly fee that varies widely by region and by whether chemicals are included, so get local quotes. Doing it yourself trades that fee for about twenty minutes a week and getting the chemistry right, which is what the calculators here are for.
Get the exact dose
Every calculator here is free, works without an account, and shows the actual product amount for your pool's volume.
Fix a specific problem
Answer-first troubleshooting for the things that actually go wrong.
Why is my pool green (and how to fix it fast)
A green pool is almost always an algae bloom caused by too little chlorine. The fix is a big, sustained dose of chlorine…
How to clear cloudy pool water
Cloudy water usually comes from one of three things: not enough chlorine, high pH or alkalinity, or a filter that needs …
Why your pool won’t hold chlorine
If chlorine disappears, you usually have one of three problems: no stabilizer (CYA), so sunlight burns it off; an algae …
How to lower your pool’s pH
High pH stings eyes, reduces chlorine efficiency, and can cloud water. Lower it with muriatic acid (or dry acid). The am…
Pool chemical dosage chart
Every dose you are likely to need, in one place, in both unit systems. The tables below are per 10,000 gallons and per 1…
Pool chemicals explained
The pool aisle sells about thirty products that do roughly eight jobs. Here is what each chemical actually is, when you …
How to raise your pool’s pH
Low pH is corrosive: it eats heater cores and etches plaster. Which product you use depends on your alkalinity. If alkal…
How to lower cyanuric acid (CYA)
Nothing you can pour in removes cyanuric acid. The only reliable fix is dilution: replace part of your water with fresh.…
Saltwater pool maintenance
A saltwater pool is a chlorine pool. The generator makes chlorine from salt instead of you pouring it, so the chemistry …
Pool scale, etching & water balance (LSI)
Crusty scale means your water balance (LSI) is too high; rough, etched plaster means it’s too low. The Langelier Saturat…
Salt cell not producing chlorine?
A salt generator needs three things to make chlorine: the right salt level, a clean cell, and water that’s warm enough. …
How to open your pool for the season
Opening a pool is mechanical first, then chemical: clean and remove the cover, reconnect and prime the equipment, top of…
How to close and winterize your pool
Closing a pool protects it from freeze damage and makes spring easy. Balance the water, lower the level, drain and blow …
Pool maintenance FAQ
How often should I do pool maintenance?
Test and dose at least weekly, plus skimming, brushing, and vacuuming in the same visit. The CDC recommends testing chlorine and pH at least twice a day, and more often when many people are using the pool, so test more in peak summer heat. Monthly, check alkalinity, CYA, calcium, and salt.
What is the correct order to add pool chemicals?
Alkalinity first, then pH, then calcium hardness, then stabilizer and salt, and chlorine last. Add one at a time with the pump running and re-test before the next. Never mix chemicals together, and never combine acid and chlorine.
How long should I run my pool pump each day?
Long enough to turn all the water over about four times a day, one pass every six hours, which Pentair’s guide gives as the industry recommendation. Hayward says 8 hours is enough for an average pool and more for a large one, and Pentair suggests starting at 12 hours and adjusting. Heat, swimmers, debris, and algae all raise the time you need.
Can I maintain a pool myself instead of hiring a service?
Yes, and most owners do. The recurring work is about twenty minutes a week. The part that trips people up is dosing, because the amount depends on your exact volume and how far off the reading is, which is the arithmetic these calculators do for you.
What are the ideal pool chemical levels?
Free chlorine at or above 7.5% of your CYA and inside Trouble Free Pool's target range, pH 7.2-7.8, total alkalinity 80-120 ppm, CYA 30-50 ppm, and calcium hardness 200-400 ppm on plaster (80-200 on vinyl or fiberglass). The full chart with notes is above.
Why does my pool keep turning cloudy or green?
Almost always free chlorine sitting below the level your stabilizer requires, sometimes combined with poor circulation or a filter that needs cleaning. If your CYA is high, the 1-3 ppm rule of thumb is far too low and algae gets ahead of you.
Sources
- CDC, Home Pool and Hot Tub Water Treatment and Testing (May 10, 2024). Test chlorine and pH at least twice a day
- Hayward, AquaRite 900 Series Electronic Chlorine Generator manual (092623 Rev D). Weekly and monthly testing schedule, cell inspection every 3 months, 8 hours of pump time for an average pool, four-year warranty
- Pentair, IntelliChlor IC15/IC20/IC40/IC60 Installation and User’s Guide (P/N 520589 Rev. R, 2023). Turnover every six hours, a 12-hour starting pump time, cell inspection every two months, about 10,000 hours of cell life
- Trouble Free Pool, CYA Chlorine Relationship (Chlorine/CYA chart). Free chlorine minimum and target by CYA
- Trouble Free Pool, SLAM Process Checklist (V2). Cleaning the filter at 25% above clean pressure
- Trouble Free Pool, Closing an In Ground Pool. Algae are unlikely to grow below about 60°F, which is when to close
- CDC, Model Aquatic Health Code, 5th edition (2024), Annex. Calcium by surface (Section 5.7.4.6)
- CDC, Pool Chemical Safety. Pool chemicals can injure people when mixed
- ATSDR, Toxicological Profile for Chlorine: Public Health Statement. Acidic chemicals mixed with bleach can release chlorine gas
Stop guessing. Get the exact fix
DoseMyPool turns your test numbers into the precise doses and the safe order to add them. Free on the App Store.