pH and Alkalinity Basics for Pool Owners
Most "I can't get my pH right" problems are actually alkalinity problems wearing a different number. A higher water table near the coast affects how excavation and dewatering are handled during a gunite pour, which is accounted for in the construction plan rather than treated as a surprise once digging starts.
Alkalinity Is the Buffer, pH Is the Target
Total alkalinity (measured in ppm) resists sudden pH swings. Too low, and pH bounces with every rain event, swimmer load, or chemical addition; too high, and pH gets locked in place and resists correction even with repeated dosing.
The practical range to aim for is 80-120 ppm alkalinity and 7.2-7.6 pH. Fix alkalinity first if it is out of range, then adjust pH; doing it in the other order usually means re-doing the pH correction once alkalinity shifts it again.
What Throws These Numbers Off
Heavy rain (common in the Houston area) dilutes alkalinity and can drop pH; pool plaster naturally leaches calcium and can raise pH slightly over time; and chlorine products themselves are mildly acidic or basic depending on the type used, which nudges both numbers with routine dosing.
Muriatic acid or sodium bisulfate lower both pH and (more slowly) alkalinity; sodium bicarbonate raises alkalinity with a smaller pH effect; soda ash raises pH directly. Knowing which lever moves which number is most of what "balancing" a pool actually is.
Where This Fits
See our Pool Repair service page, or Financing if cost is the next question.
Related Reading
Chlorine vs. Saltwater Pools: What's Actually Different
Saltwater pools still use chlorine, generated on-site; here is what actually changes in day-to-day maintenance.
A Weekly Pool Maintenance Calendar
A realistic week-by-week, month-by-month maintenance rhythm for a Houston-area pool that runs year-round, with what "good" actually looks like at each check.
Phosphates and Algae Food, Explained
Why phosphate levels matter even when chlorine and pH both test fine.
Get a Free Quote
Tell us about your project and we’ll follow up within one business day.