Pool Drain and Acid Wash in League City, TX
League City Pool Resurfacing handles pool drain and acid wash jobs in League City, Texas: emptying the pool, washing the interior finish with diluted acid to lift stains, scale and efflorescence, neutralizing the run-off and refilling. The National Plasterers Council wants an interior finish kept fully underwater throughout its service life, out of the water only for limited servicing or repair, so the time a pool stands empty is kept short.
Estimates are free by phone or through the form. Expect questions about the finish and its age, the color of the stains and when the pool was last drained.
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What a pool acid wash removes, and what it can't
Stains, scale and efflorescence
Efflorescence, in the National Plasterers Council's definition, is soluble compounds, mostly calcium hydroxide, that travel to a finish's surface with moisture and harden there. The Council's first definition of an acid wash is the job of clearing it: dissolving material from the face of a cement finish to take off efflorescence, dirt or other unwanted stains. How heavy the staining or algae is ranks among the main things that drive the price, by national 2026 cost figures.
Rust stains from the water or the steel
Rust-colored marks have two possible sources. Metals in the water stain a finish, the Council says, iron among them, in red, orange or black. Rust coming up through the plaster can instead be the steel in the shell: the American Shotcrete Association traces stains like that to shotcrete placed with too little concrete over the steel, which leaves the section much less durable than its designer intended. That kind of stain points to the shell rather than the surface.
When the finish needs more than a wash
Some problems are beyond any wash. Hollow spots, peeling plaster and stains that need torching are pool plaster repair, and plaster worn rough and pitted across the pool is ready for pool replastering.
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(281) 694-4352The pool drain and acid wash, step by step
The steps below are the makers' and the industry bodies' instructions, in the order a wash runs.
Empty and clear the pool
Once the water is out, debris, organic matter and silt come out next, with power washing where the surface needs it. That is the order the Pool & Hot Tub Alliance's water-quality committee gives for cleaning a drained pool after a flood.
Wash from the deep end up
SGM's acid-wash steps for its Diamond Brite finish begin in the deep bowl and work up to the shallow end to avoid streaks, leave the walls and steps for last, never let the solution puddle in the bowl, and add an acid-wash additive to cut the fumes, with proper safety equipment worn throughout.
Neutralize the run-off
As the wash runs, a sump pump keeps removing the run-off, but only after it has been diluted and neutralized, and the spent solution is disposed of as local rules require. Any acid still on the finish gets soda ash and water so it doesn't discolor, SGM says.
Chlorine wash, rinse and refill
Where a pool needs a chlorine wash as well, the committee's flood clean-up steps put the acid wash first, a thorough rinse between the two, and never a mix of chlorine and acid. The refill then puts the finish back underwater.
League City Pool Resurfacing will talk through the drain, the wash and the refill for your finish before any water comes out.
Call or request a free estimate any time, 24/7.
(281) 694-4352Draining a pool for an acid wash in League City
Groundwater, discharge and the refill
An acid wash can't start until the pool is empty, and emptying it is where the risk sits: national cost guides warn that the full drain an acid wash needs can let groundwater pressure push a concrete pool out of the ground. League City's wet soils, relief valves, where drained water may go and the refill are all set out in the guide to draining a pool before resurfacing.
Drought stages and an acid wash
Stage 2 of League City's 2024 drought plan lets the City bar draining and refilling, with exceptions that include "proper operation and maintenance", and the plan doesn't say whether an acid wash counts as that; Stage 3 allows no drain-and-refill. No stage was in force on any official page read on October 4, 2026, so the City is the one to ask, before the water comes out.
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(281) 694-4352Pool acid wash questions
How much does an acid wash cost for a pool?
We found no published Houston-area price for draining and acid washing a pool. National 2026 averages run $250 to $600 for an acid wash, $450 being typical, and most owners pay somewhere from $120 to $1,500, by the pool's size and condition; refilling costs extra. Priced by area, the same figures work out to about $280 for a 10-by-20-foot pool 6 feet deep, which has 560 square feet of walls and floor, at $0.40 to $0.60 a square foot. These are published averages, not prices from League City Pool Resurfacing, and a look at the stains is free.
How long does it take to acid wash a swimming pool?
The wash itself averages about four hours of work, by national 2026 cost figures, which price that labor at $80 to $200 an hour, with surface area, the severity of stains or algae and the finish material moving the time. Draining comes before the wash and the refill after it, and no maker or body we read puts a time on either for an acid wash.
How many times can you acid wash a plaster pool?
No maker or industry body we read gives a number. By the National Plasterers Council's own definition, a wash works by dissolving material from the finish's surface. Universal White Cement's advice is to avoid frequent drain-and-acid washes: the plaster may look whiter for a short time, it says, at the cost of years of its life. National cost guides describe the wash the same way, as stripping away a thin layer of the pool's surface with muriatic acid.
What kind of acid do you use to acid wash a pool?
Muriatic acid, diluted; national cost guides call it hydrochloric acid, also known as muriatic acid. In its guidance for cleaning a pool after a flood, the Pool & Hot Tub Alliance's committee lists 10 percent muriatic acid, made by slowly adding one part muriatic acid to ten parts water, as a typical surface cleaner for the emptied pool, with liquid bleach the other. SGM also uses muriatic acid and water to etch an old shell clean and rough before new plaster goes on.
Can a pool be acid washed without draining it?
Not the whole finish. National cost guides describe an acid wash as a job that requires completely draining the pool, and SGM's procedure washes the empty bowl from the deep end up. A white line of calcium on the waterline tile is a separate job: Kramer Industries' blasting method brings the water down to about 6 inches under the tile rather than emptying the pool, and it's covered under pool tile cleaning.
Book a free pool drain and acid wash estimate in League City
Tell League City Pool Resurfacing what finish the pool has, what color the stains are and when it was last drained. Calls and estimate requests are answered 24/7.