Maintenance
Hard Water & Calcium Scale: The Quiet Killer of Texas Pools
Central Texas tap water is very hard — loaded with dissolved calcium. As pool water evaporates in the heat, calcium concentrates and deposits as white scale on tile, plaster, heaters, and salt cells. Keep calcium hardness between 200–400 ppm, keep pH from drifting high, brush the waterline weekly, and schedule periodic deep cleaning or descaling before buildup turns into equipment damage.
That chalky white line creeping along your tile isn't just cosmetic. It's calcium scale — and in Central Texas it's nearly inevitable, because our tap water comes out of limestone aquifers absolutely loaded with dissolved calcium.
Why Texas pools scale so fast
Two forces gang up on Austin-area pools: hard fill water (often 200+ ppm calcium straight from the tap) and brutal evaporation. Every gallon that evaporates in July leaves its calcium behind. Top off all summer and the concentration ratchets up month after month. Once calcium hardness passes ~400 ppm and pH drifts high, the water starts shedding calcium onto every surface it touches.
What scale actually costs you
- Tile & plaster: the white waterline ring, rough plaster, and stains that regular brushing can't remove.
- Heaters: scale coats the heat exchanger, slashing efficiency and shortening its life — a four-figure repair.
- Salt cells: calcium plates onto the cell and kills chlorine production years early.
- Filters & plumbing: reduced flow, higher pressure, harder-working pump.
How to fight it
- Test calcium hardness monthly — target 200–400 ppm.
- Hold pH at 7.4–7.6 — high pH is the trigger that makes calcium fall out of solution.
- Brush the waterline weekly before deposits harden.
- Partial drain & refill when hardness climbs too high — counterintuitive in Texas, but cheaper than a heater.
- Periodic deep cleaning — professional tile descaling and, where needed, acid washing resets the surfaces.
Scale is a slow problem — which is exactly why it wins. By the time it's obvious, it's expensive. Our deep cleaning & detailing service removes existing buildup, and weekly service keeps the chemistry in the zone where scale never forms in the first place.
See white buildup on your tile or a scaled salt cell? Get a free assessment — catching it early is dramatically cheaper.
Frequently asked questions
How do I remove calcium scale from pool tile?
Light scale responds to a pumice stone or scale remover; heavy buildup needs professional bead-blasting or acid-based descaling. The key is also fixing the water chemistry so it doesn't come right back.
What should calcium hardness be in a pool?
Aim for 200–400 ppm. Below 150 the water turns aggressive and etches plaster; above 400 it starts depositing scale on surfaces and equipment.
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