Pool Draining & Acid Wash in Phoenix — Stain Removal, Fresh Start
An acid wash isn't resurfacing — it removes the top oxidized layer of plaster along with the staining, mineral deposits, and algae that have worked into the surface. For a pool that's been neglected, had a chemical imbalance, or had algae bloom through the surface, it's often the right call before committing to a full resurface. In Phoenix, TDS (total dissolved solids) buildup from alkaline municipal water also makes a drain-and-refill necessary every few years regardless of surface condition.
When Chemicals Aren't Fixing the Problem Anymore
If you've shocked the pool three times and it's still green, or if staining runs deep in the plaster and won't respond to brushing and treatment — the issue isn't the water chemistry. It's the surface. Algae that's colonized porous plaster can't be killed from the water side alone; it's established inside the plaster, where chlorine can't reach concentration. At that point, the pool needs to come out of service, get drained, and get treated directly.
Phoenix water also has high TDS — total dissolved solids from calcium, minerals, and chemical buildup. Once TDS climbs past 2,500–3,000 ppm, no amount of fresh chemistry balances well. The water itself has become the problem. The only fix is a full drain and refill. An acid wash done at the same time clears any surface staining before the fresh water goes in.
Most Phoenix homeowners who need an acid wash have been fighting the same problem for 4–8 weeks. It's one of those situations where the faster you act, the less damage you're dealing with.
How Pool Draining & Acid Wash Works
Assessment & Quote
We assess the pool condition — stain type, TDS level if known, algae severity — and provide a written quote. We'll also tell you honestly if the surface needs a full resurface instead of or after the wash.
Full Pool Drain
Pool drained completely. We use submersible pumps and comply with Phoenix/Maricopa County drain water disposal requirements — pool water can't just flow to the street.
Acid Wash Application
Muriatic acid solution is applied to the pool shell, scrubbed, and rinsed. This removes staining, calcium deposits, and the oxidized plaster surface layer. Acid is neutralized with soda ash before disposal.
Refill & Chemistry Startup
Pool refilled with fresh water. Startup chemistry set correctly for Phoenix alkaline water. You'll be swimming within a few days of the refill.
What Every Drain & Acid Wash Job Includes
- Full pool drain — compliant disposal per Maricopa County regulations
- Acid wash application, scrub, and acid neutralization
- Rinse and inspection before refill
- Refill startup chemistry calibrated for Phoenix water
- Written quote before work begins
- Honest assessment: if the surface needs more than a wash, we'll tell you
What Does a Pool Drain & Acid Wash Cost in Phoenix?
A standard pool drain and acid wash in Phoenix runs $350–$600. The range reflects pool size and stain severity. This includes drain, acid wash, acid neutralization, and refill startup. If additional surface treatment or partial chip-out is needed, that's quoted separately and clearly — nothing proceeds without your approval.
Questions We Hear Most
When does a pool need a full resurface instead of an acid wash?
If the plaster is rough, pitting, delaminating, or past 8–10 years, an acid wash is a band-aid — it removes staining but doesn't restore the surface. We'll tell you honestly during the assessment. A wash makes sense when the plaster is structurally sound but cosmetically compromised. A resurface makes sense when the plaster itself has failed.
How often do Phoenix pools need draining?
Most Phoenix pools need a full drain every 3–5 years due to TDS accumulation from hard municipal water. You can track it with a TDS meter — above 2,500 ppm, water chemistry becomes increasingly difficult to manage. A drain and refill resets the baseline.
Does acid washing damage the plaster?
It removes a very thin layer of oxidized plaster — typically 1/32" or less. This is intentional: that oxidized layer is what holds the staining. The underlying plaster is unaffected. That said, repeated acid washes on the same plaster do thin it over time, which is why we recommend full resurfacing when plaster is near end of life.
How long is the pool out of service?
Typically 3–5 days total: 1–2 days to drain, half a day for the wash, and 1–2 days to refill. Phoenix pools fill quickly. Add 1–2 days for startup chemistry to stabilize before swimming.