You do not need a chemistry degree to understand pool water, but knowing what the five main readings mean makes you a far better pool owner. Here is a plain-English guide to what each one does and why it matters for a pool in Carson City.
Pools in Carson City live with high-desert weather at about 4,700 feet on the Sierra front: hot dry summers, cold snowy winters, and strong afternoon winds. That drives everything from how fast chlorine burns off to how often filters need cleaning, so advice from a different climate rarely fits Northern Nevada and the Carson Valley.
Sanitizer: chlorine
Chlorine kills bacteria and algae. Free chlorine is the working amount; combined chlorine is the used-up portion that causes the sharp smell and stinging eyes people wrongly blame on too much chlorine. Keep free chlorine in the normal range, and when combined chlorine builds up, shock the pool to burn it off. Salt pools make their own chlorine but still need the level checked. Sun and heat in Northern Nevada and the Carson Valley consume chlorine fast, so the summer dose is very different from the winter one.
Calcium hardness and stabilizer
Two readings that owners often ignore: calcium hardness keeps the water from attacking plaster or leaving scale, and stabilizer keeps sunlight from destroying the chlorine. Both need to be in range, and both drift slowly over a season, with stabilizer rising every time stabilized chlorine tablets are used.
Total alkalinity: pH's shock absorber
Alkalinity buffers pH so it does not bounce around after every rain or swim. Low alkalinity makes pH unstable and hard to hold; high alkalinity makes it drift upward and resist correction. It is adjusted with baking soda to raise it or acid to lower it, and it should be set before fine-tuning the pH.
pH: the master reading
If only one reading is checked, it should be pH. When it drifts high, the chlorine in the water stops doing its job and scale builds on tile and equipment; when it drops low, the water eats at heaters and grout. Muriatic acid lowers it and soda ash raises it, and small, regular adjustments beat big swings.
Testing and adjusting the right way
Test weekly at minimum, more often in peak season, and adjust in small steps with the pump running. Add chemicals to water rather than water to chemicals, never mix them, and give each one time to circulate before retesting. If the readings will not settle, something else is going on, and that is where Carson City Pool Service can help Carson City owners find the cause.
Key takeaways
- pH controls whether chlorine works; correct it first.
- Alkalinity keeps pH stable; stabilizer keeps chlorine alive in the sun.
- Test weekly and adjust in small steps with the pump running.
Frequently asked questions
Why does my pool smell strongly of chlorine?
That smell is combined chlorine, the used-up form, which means the pool needs shocking rather than less chlorine.
Are test strips accurate enough?
They are fine for a weekly check between service visits. A liquid test kit or a professional test is more accurate for stabilizer, calcium and fine pH adjustments.
Would rather leave the chemistry to someone else? Carson City Pool Service tests and balances every week for pools across Carson City. Call (775) 306-3454.