What hard water does to a pool surface
East Valley water arrives loaded with calcium. Every month, your pool loses inches of water to evaporation — but the calcium doesn’t evaporate. It stays, concentrates, and eventually comes out of solution onto your surfaces: a white crust at the tile line, gray film over the plaster, rough patches your feet notice before your eyes do.
Add a few years of metal staining, the occasional algae event, and normal chemistry drift, and even a well-kept pool ends up wearing a surface you can’t brush clean. That’s the point of a wash: it resets the plaster itself.
Acid wash vs. chlorine wash
An acid wash strips a whisper-thin layer off the plaster, taking the bonded scale and mineral stains with it. It’s the tool for calcium crust and stubborn discoloration, and it makes tired plaster look dramatically better. Because it removes material, it’s used deliberately — not on a schedule.
A chlorine wash saturates the emptied pool’s surfaces with a strong chlorine solution, killing everything and lifting organic staining without abrading the plaster. It’s the standard finish after a long-neglected green pool gets drained, and the safer option for older, thinner plaster.
Which one you need depends on what your stains are made of and how much plaster you have left. We’ll tell you plainly — including the case where the honest answer is “this plaster is at end of life, save the wash money toward a resurface.”
How the job runs
- Assessment. We look at the surface, the stains, and the water, and confirm a wash is the right tool.
- Drain. Full drain to the sewer cleanout, per city rules. In summer we schedule carefully — an empty pool in Arizona sun needs to be worked and refilled promptly.
- Wash. Working in sections, top to bottom, with the mix matched to your surface’s condition.
- Neutralize and rinse. The residue is neutralized and removed so it never touches your new fill water.
- Refill and startup. Fresh water needs correct startup chemistry from day one — otherwise brand-new scale starts forming immediately. We set it, then hand the pool back.
What it costs
Pricing depends on pool size, how heavy the buildup is, and which wash the surface needs. The water bill for the refill is the other real cost, and it’s why we talk you out of a wash you don’t need — if photos tell us a chemical stain treatment could do the job with the water still in the pool, that’s what we’ll recommend.
Keep it from coming back
Scale returns at the rate your chemistry allows. After a wash, weekly service keeps the calcium managed and the surface smooth — and if your tile line is the main complaint, ask us about options when we quote the job.