Pool Maintenance Guide: water parameters and cleaning frequencies
What levels chlorine, pH and alkalinity should be at, how often to touch the sand filter, skimmer, pump prefilter, pool vacuum or brush — and why keeping all this on paper and spreadsheets is costing you money.
Paper and spreadsheets vs. work-tracking software
Almost every pool maintenance professional starts the same way: a notebook in the car, a WhatsApp group, and a spreadsheet listing the pools. It works with 10 pools. With 30 it starts to break, and with 60 it collapses: reports get wet or lost, visits are duplicated, nobody remembers reporting an issue, and customers ask "are you sure you came last week?" with no way to prove it.
The problem isn't lack of work, it's lack of traceability. A paper history can't be pulled up in 5 seconds in front of a customer, doesn't compare a pool's pH trend over two months, and doesn't warn you that a pool has gone 12 days without a visit.
Paper and spreadsheets
- Reports that get lost, get wet, or never get typed up
- No technician signature or proof of the visit
- History impossible to look up on site
- Every technician writes notes their own way
- Issues forgotten in the car
- Hours of office work each week entering data
Work-tracking software
- Digital report signed by the technician on their phone
- Chlorine, pH and alkalinity readings with full history
- Photos of the pool's condition on every visit
- Weekly routes and schedule per technician
- Issue inbox tracked through to resolution
- Automatic email to the owner after the visit
See how it works on the pool maintenance software page or the digital visit report details.
Water parameters: correct values and measurement frequency
These are reference ranges for a residential chlorine pool. Always adjust in this order: alkalinity → pH → chlorine.
| Parameter | Optimal range | Frequency | Why it matters |
|---|---|---|---|
| Free chlorine | 1 – 3 ppm (mg/l) | 2–3 times a week (daily in peak summer) | Below 1 ppm the water is no longer disinfected; above 3 ppm it irritates eyes and skin. |
| pH | 7.2 – 7.6 | 2–3 times a week | The key parameter: with high pH, chlorine loses most of its disinfecting power. |
| Total alkalinity (TA) | 80 – 120 ppm | Once a week | Acts as a pH buffer. If it's low, pH will swing every day. |
| Calcium hardness | 200 – 400 ppm | Once a month | Low corrodes; high causes scale buildup on the waterline and filter. |
| Cyanuric acid (stabilizer) | 30 – 50 ppm | Once a month | Protects chlorine from the sun. Above 80 ppm, chlorine gets locked. |
| Water temperature | 24 – 28 °C (75–82 °F) | Every visit | Higher temperature means more chlorine consumption and higher algae risk. |
Common reference values for residential chlorine pools; always check local regulations and the manufacturer's instructions for your products.
Cleaning and maintenance: how often to do each task
Sand filter backwash
Every 1–2 weeks, or when the pressure gauge rises 0.3–0.5 bar above working pressure
Backwash for 2–3 minutes until the sight glass runs clear, followed by 30–60 seconds of rinse. Replace the sand every 4–5 years.
Skimmer basket
2–3 times a week (daily if trees are nearby)
A full basket reduces flow, makes the pump work harder, and stops collecting floating debris.
Pump prefilter / hair-and-lint basket
Once a week
Stop the pump, close the valves, empty the basket and check the lid gasket. It's the #1 cause of flow loss and burnt-out pumps.
Pool vacuum / cleaner
1–2 times a week
Vacuum the full floor. With a robotic cleaner, check and clean its filter after every cycle.
Brushing walls, steps and corners
Once a week
Prevents algae from taking hold in dead zones where circulation doesn't reach.
Waterline (oil and grime)
Once a week
Use a dedicated waterline degreaser and a non-abrasive sponge: remove sunscreen and body oils before the brown stain sets in.
Pressure gauge and filtration time check
Every visit
Rule of thumb in summer: filtration hours ≈ water temperature (°C) ÷ 2.
Recommended weekly routine
- Monday: measure chlorine, pH and alkalinity. Correct and log the readings.
- Tuesday: empty the skimmer basket and check the pressure gauge.
- Wednesday: vacuum or run the robot and brush walls, steps and corners.
- Thursday: clean the waterline with degreaser and empty the pump prefilter.
- Friday: second chlorine and pH check before the busier weekend.
- Biweekly: sand filter backwash and rinse.
- Monthly: calcium hardness, cyanuric acid, and check gaskets, lids and filtration time.
This routine is exactly what software turns into assigned tasks and signed reports: each line stops being a mental reminder and becomes a record with a date, technician and photos.
Keep learning
Frequently asked questions
What chlorine, pH and alkalinity levels should a pool have?+
Free chlorine between 1 and 3 ppm, pH between 7.2 and 7.6, and total alkalinity between 80 and 120 ppm. Always adjust alkalinity first, then pH, and finally chlorine: fixing them in that order avoids chasing readings all season.
How often should you backwash a sand filter?+
Every 1 to 2 weeks in season, or sooner if the pressure gauge rises 0.3 to 0.5 bar above normal working pressure. The backwash itself takes 2–3 minutes, finished off with 30–60 seconds of rinse.
How often do you clean the skimmer basket and the pump basket?+
The skimmer basket, 2 or 3 times a week (daily if there are trees nearby). The pump prefilter or hair-and-lint basket, once a week, always with the pump stopped and the valves closed.
Why use software instead of paper and spreadsheets?+
Because paper doesn't alert you, can't be searched, and gets lost. With software every visit is logged with readings, products used, photos and the technician's signature; you can pull up a pool's history in seconds, prove what was done if a customer complains, and catch pH or chlorine drift before the water turns green.
How do I show my customer what I did on each visit?+
With a digital visit report signed on the phone and an automatic email to the owner listing the parameters measured, the products applied, the tasks completed and photos of the pool's condition.
How much does pool maintenance cost?+
As a rough guide, regular maintenance for a residential pool usually runs between €50 and €120 a month depending on size, frequency and location. Yearly, including products and small repairs, it's typically between €600 and €1,500. Consistent prevention is always cheaper than fixing green water.
How can I save money on pool maintenance?+
Keep chlorine and pH in range all year (prevention is far cheaper than correction), cover the pool to cut down on debris and evaporation, don't skip filter backwashes, and always test before dosing: adding product by eye is the most expensive way to maintain a pool.
Do you run a pool maintenance business?
Log visits, products and photos from your phone and send the report to the customer automatically.