Pool Acid Wash Charlotte, NC
Drain, acid wash or chlorine wash, neutralize, refill and rebalance for stained plaster and pebble pools in Charlotte, Matthews, Weddington, Waxhaw and Fort Mill.
Pool Acid Wash Service for Stained Charlotte Pools
Acid takes plaster off. We only use it when the finish can afford to lose some.
A plaster pool in Charlotte picks up stains in a few predictable ways. Willow oak leaves sit on the floor through November and leave brown tannin shadows. A pool that went green over the winter keeps a grey ghost of the algae after the water clears. Calcium we add to Charlotte’s soft fill water ends up as a chalky haze on the walls once pH drifts high over a summer. Brushing and chemicals handle most of it. When they stop working, the surface itself needs attention.
Damon’s Pool Care drains the pool, washes the plaster, pebble or gunite finish, neutralizes the runoff and refills. The wash is either a chlorine wash or an acid wash, and we choose based on the stain and the age of the finish. Chlorine lifts organic stains and algae without removing any plaster. Acid dissolves a thin layer of the surface and takes the stain with it. We use acid rarely and work in small sections with the hose running. Once the pool is full, calcium and alkalinity go in the same day. Fresh plaster in soft Charlotte water starts to etch quickly without them.
This is for plaster, pebble and gunite pools, not vinyl or fiberglass. Owners book it before a sale, after years of neglect, or when a green recovery leaves a stained floor. Send photos through the quote form or call (980) 998-3777 and we will tell you which wash fits. Acid washing is part of our specialty pool services in Charlotte.
Why a Pool Acid Wash Is Sometimes the Right Call in Charlotte
What stains a Charlotte plaster pool, and why some of it will not brush off
Plaster is porous. Stains that sit on a smooth surface for a few days wipe off with a brush and a little chlorine. Stains that sit for a season soak into the top layer, and no amount of brushing reaches them. Charlotte gives a pool several chances a year to pick up that kind of stain. Many calls we get for an acid wash do not end in an acid wash. Often a chlorine wash does the job. Some of the time the stain is metal and needs neither.
Leaves, tannins and algae ghosting
Willow oaks in Myers Park, Dilworth and Eastover shed small leaves from October into December. They sink, settle in the deep end and bleed tannin into the plaster underneath. A pool that sat green through a winter is worse. The algae dies when the water is shocked, but the pigment stays in the plaster as a grey or green shadow. Both are organic stains. Both respond to chlorine, which is why a chlorine wash is our first choice for them.
Calcium haze from soft water that got corrected
Charlotte Water is soft, with calcium hardness near 25 ppm at the tap. We add calcium to every pool so the water does not eat the plaster. If pH then climbs through a hot summer, some of that calcium comes back out as a white film on the walls and tile line. Pools with a heater see it first. The film is calcium carbonate. Acid dissolves it on contact, which is why a light acid wash clears a hazy pool so quickly.
Metal stains on well water and older plumbing
Parts of Weddington, Marvin and Waxhaw are on well water. Wells bring iron and sometimes manganese, and both leave brown or purple-black stains. Copper from an old heat exchanger or from copper algaecide leaves blue-green streaks. These are not acid-wash stains. A metal stain needs a sequestering or ascorbic acid treatment, and acid washing a metal stain can spread it. We test for metals first so you do not pay for the wrong job.
Rough spots from past etching
Some pools come to us already rough. A previous acid wash left too long, low alkalinity for years, or soft fill water never corrected will all etch plaster. Rough plaster holds algae and dirt harder than smooth plaster does. An acid wash on an already thin, etched surface is a bad idea. In those cases we say so and talk about resurfacing instead.
The point of all this is that the stain decides the method. Our job is to match the cause to the wash, and to tell you honestly when neither wash will help.
What Our Pool Acid Wash Service Includes
An acid wash is a one or two day job depending on how fast the pool drains and refills. Here is how it goes on a Charlotte pool.
Timing the drain
We check the weather and the yard before we pull the plug. Draining a pool in a wet week, or in a low spot that holds groundwater, puts pressure on the shell from below. The hydrostatic relief valve in the main drain is opened so groundwater can enter rather than lift the pool. Late winter and early spring, before pollen, is the easiest window in Charlotte. Heavy rain, or the days right after it, means we wait.
Draining and surface inspection
The pool is pumped down to the floor and the last water is pushed to the drain. With the shell dry we walk every surface. We look for cracks, hollow spots that sound different under a tap, delamination at the tile line and exposed aggregate. If the plaster is too far gone for a wash, you hear it now, not after the bill. We also ask the plaster’s age if you know it. An old finish is close to the end regardless of what the stains look like. Plenty of pools in Ballantyne and Providence Plantation are still on their original plaster, and age changes what we recommend.
Chlorine wash or acid wash
A chlorine wash means spraying liquid chlorine across the wet plaster, brushing and rinsing. It lifts algae ghosting, leaf tannins and most organic staining, and it removes no plaster at all. An acid wash means a diluted muriatic acid mix applied in sections, brushed immediately and rinsed before it has time to sit. It removes a thin layer of plaster along with calcium haze and stubborn stains. One or the other is chosen before we start. Sometimes a chlorine wash first means the acid wash is not needed.
Safety and protecting the yard
Muriatic acid gives off fumes and burns skin and eyes. We work in respirators, gloves and boots, with the pool open to the air and a hose running the whole time. Deck edges, coping and any plants near the pool get wet down and covered before the first bucket is mixed. Pets and kids stay inside for the day. None of this is dramatic. It is the part a weekend DIY job usually skips, and it is where people get hurt.
Neutralizing and pumping out
Acid runoff cannot go into the yard or the storm drain. It collects at the main drain, gets neutralized with soda ash until it reads neutral, and is pumped out. Then the shell is rinsed again. Skipping this step is how acid washes damage decks, landscaping and the pool’s own plumbing.
Refill and start-up chemistry
Refill comes from your hose, so plan on a day or more depending on the pool. Soft Charlotte water hits a freshly washed finish hungry for calcium. The day the pool is full we add calcium chloride to get hardness into the 200 to 400 ppm range, bring alkalinity to 80 to 120 ppm and set pH at 7.4 to 7.6. Stabilizer goes in at 30 to 50 ppm. Then chlorine. Nobody swims until chlorine and pH read in range, which lines up with the CDC’s healthy swimming basics. The order matters and so does the speed.
A washed pool goes back into normal service the next week. Most owners pair the job with a filter cleaning, since whatever stained the pool also loaded the filter. A sand filter that swallowed a green winter may be due for a sand change. If the stains came from a pool that sat green, read about our green to clean service as well. Tile line scale is a separate job handled by pool tile cleaning.
How Often Can a Pool Be Acid Washed?
Rarely. Every acid wash removes plaster, and a plaster finish only has so much to give. Once or twice in the life of a finish is the honest number. A pool that has been washed three or four times usually shows it: thin spots, exposed aggregate and a rough feel underfoot. A chlorine wash has no such limit because it removes nothing. That is one more reason we start there. Pebble finishes hold up better than smooth plaster because the aggregate takes the wear, but the cement between the pebbles still thins. Gunite with an old plaster coat is the most fragile of the three. If a pool is staining badly enough to want an acid wash every few years, the real problem is water balance. In that case weekly pool service is a cheaper fix than plaster.
Signs Your Pool Needs an Acid Wash, and What to Expect
The pool looks grey or dingy with the water tested and balanced. Brushing and shocking have not moved the stains. The floor shows the shape of last year’s leaf pile. There is a white haze on the walls, and a drop of diluted acid on a dry patch fizzes, which tells you it is calcium and an acid wash will clear it. You are listing the house and the pool photos are costing you.
Here is what to expect. The pool is out of use for several days, the yard needs hose access, and the finish will look brighter and feel slightly different afterward. A freshly washed surface is more porous, so the first month of chemistry matters more than usual. We leave you with the numbers we set and what to watch. Do not expect a brand new pool. Deep stains that have been there for years fade rather than vanish. A finish with ten years on it still looks like a ten year old finish, just a clean one, and spots that were already thin may show more aggregate after the wash. Acid washing is not a repair for cracks, hollow plaster or leaks, and we will tell you when a pool needs resurfacing instead.
Why Charlotte Homeowners Choose Damon's for Pool Acid Washing
An acid wash is easy to sell and easy to do badly. Streaks, rough patches and a shortened plaster life are the usual results of a rushed job. We take longer, work in sections and keep the hose running. We also say no when the surface cannot take it. The written quote names which wash you are getting and why, and nothing changes without a call. Pricing depends on pool size, finish, how badly it is stained and how long the drain and refill take, so we quote after seeing it.
Damon has serviced Charlotte pools for more than ten years, from Myers Park and SouthPark to Ballantyne, Providence Plantation, Matthews, Weddington, Marvin, Waxhaw, Fort Mill and Indian Land. His Google reviews keep saying the same things: honest about what you need, fair on price, and the water stays clear. Call (980) 998-3777 or request a quote with a few photos of the stains. You will get a straight answer on whether it is a chlorine wash, an acid wash or something else entirely.
Our Service Areas
- Charlotte, NC
- Ballantyne
- Matthews
- Stallings
- Weddington
- Wesley Chapel
- Waxhaw
- Marvin
- Fort Mill, SC
- Indian Land, SC
Pool Acid Wash Questions From Charlotte Homeowners
What Charlotte owners ask us before draining a pool. Photos help; send them with the quote request.
It depends on the pool's size, the finish, how heavy the staining is, and how long the drain and refill take. A chlorine wash costs less than an acid wash because it uses less material and fewer steps. Start-up chemicals for the refill are part of the job. Damon's Pool Care gives a written quote before any water leaves the pool, and the quote says which wash you are getting.
Rarely, once or twice in the life of a plaster finish. Each wash removes a thin layer of plaster, so the surface gets thinner and rougher every time. If a pool seems to need one every few years, water balance is the real problem. A chlorine wash removes no plaster and can be repeated when stains return. Most Charlotte pools do fine with good chemistry and brushing between washes.
Draining with the hydrostatic valve opened, a full inspection of the dry shell, the wash itself in sections with constant rinsing, neutralizing and pumping out the runoff, a final rinse, and refill. Then start-up chemistry the day the pool is full: calcium, alkalinity, pH, stabilizer and chlorine. You get the numbers we set, and the clean filter pressure if we service the filter at the same time.
The wash itself takes a few hours. Draining takes most of a day on a typical Charlotte pool, and refilling from a garden hose takes a day or more depending on gallons and water pressure. Plan on the pool being out of use for several days start to finish. Weather can stretch it, since we will not drain during or right after heavy rain.
It is worth it when the plaster is sound and the problem is staining or calcium haze. It is not worth it when the plaster is thin, rough, cracked, hollow or delaminating. An acid wash on a failing finish makes it fail faster. We inspect the dry shell before washing and tell you honestly if resurfacing is the better money. That inspection is part of every job.
Chlorine wash for organic stains: algae ghosting, leaf tannins, general dinginess after a green winter. It removes no plaster. Acid wash for calcium haze, mineral film and stains that chlorine did not touch. If you are unsure, try chlorine first. If the stain fizzes when you dab a little diluted acid on a dry section, it is calcium, and acid is the answer.
Usually a chlorine wash fixes it, because algae ghosting is organic. Clear the water first, brush and vacuum the dead algae, and see what stays. If grey shadows remain after a couple of weeks of good chlorine levels, drain and chlorine wash. Acid only comes into it if there is calcium or mineral staining underneath. Check the filter too; a green pool loads it heavily.
No. Acid needs to go on a dry or barely damp surface in sections you can control, and the runoff needs to be neutralized before it is pumped out. Acid dripping into water you are still pumping out ends up in the yard or the storm drain. Finish draining, inspect the plaster, then wash. The whole job is about control, and a half-drained pool offers none.
The acid sat too long, was too strong, or was not rinsed fast enough, and it etched the surface instead of cleaning it. Etched plaster cannot be made smooth again by washing. Light etching can be lived with if water is kept balanced, though rough spots collect algae. Heavy etching means resurfacing. Keeping calcium and alkalinity in range from now on stops it getting worse.
Yes, a little each time. Every acid wash removes a thin layer, so two washes over a finish's life are tolerable and five are not. The bigger threat to Charlotte plaster is daily chemistry: soft fill water with no calcium added, or alkalinity left low, etches more plaster over a few years than one careful acid wash does. Keep hardness at 200 to 400 ppm and the finish lasts.