Pool Acid Wash in Pasadena, CA

A pool acid wash in Pasadena is usually a response to hard water, a long green spell or ash that sat in the pool, any of which can leave plaster gray, blotchy or rough with scale. We drain the pool, wash the surface with diluted acid in sections and refill it with water balanced for the city's supply.

Because acid strips a thin layer of plaster along with the stains, the wash only makes sense on a sound surface, and we tell you plainly when yours is not. Replastering and resurfacing are outside what we offer. Our other services are listed on the Pool Cleaning Los Angeles homepage.

Pool Acid Wash in Pasadena: What Makes It Different

About half of Pasadena Water and Power's 2025 supply came from Raymond Basin groundwater and the rest from the Metropolitan Water District. The utility explains that imported water is hard because it travels hundreds of miles over mineral formations, and its tap water averaged about 222 ppm of hardness, or 13 grains per gallon. (Source: Pasadena Water and Power) Each inch of evaporation you replace with that water leaves more calcium behind, which is where rough white scale on plaster comes from.

Stains are the other local story. Researchers estimated that about 2,700 pools in the Eaton Fire area were affected by the fire, and the same study found no metal levels of concern for recreational water. (Source: L.A. Pools Study) The vector control district expected to have treated 1,475 non-functional pools in the burn area by mid-2025. (Source: SGV Mosquito and Vector Control District) Plaster left under ash, leaves or algae that long can stay blotchy after the water clears, a cosmetic problem an acid wash can often fix.

What's Included in a Pasadena Acid Wash

• Plaster assessment. We confirm the surface is sound and identify whether stains are mineral, metal or organic.
• A planned drain. Pool water goes only where local discharge rules allow, dechlorinated where they require it.
• Sectioned washing. Acid is applied and rinsed one area at a time, so nothing etches longer than needed.
• Neutralized rinse water. Treated before it is pumped out, never sent toward the street.
• Balanced refill. Alkalinity and pH first, then calcium and chlorine in steps, with brushing through the first weeks.

The full process and the alternatives to a pool acid wash in Pasadena are on our pool acid wash service page.

Drain Rules and Water Use in Pasadena

Where the water goes matters as much as the wash. After the Eaton Fire, the city's guidance for ash-affected pools said wastewater belongs in a municipal sewer only and that backwashing into driveways, gutters, streets or storm drains is prohibited by law. (Source: City of Pasadena) We follow local discharge rules on every drain, fire-related or not.

Refilling takes a full pool of water, and Pasadena has been under Level 2 of its Water Supply Shortage Plan since September 2021. (Source: Pasadena Water and Power) We check PWP's current rules before any pool acid wash in Pasadena and refill as soon as the wash is finished.

More From Pool Cleaning Los Angeles

Read the full details on our pool acid wash service in Los Angeles, or see everything we do on the Pool Cleaning Los Angeles homepage.

Pool Acid Wash near Pasadena:

• Pool Acid Wash in Arcadia
• Pool Acid Wash in Glendale
• Pool Acid Wash in Beverly Hills

Other services in Pasadena:

• Weekly Pool Cleaning in Pasadena
• Green Pool Cleanup in Pasadena
• Pool Equipment Repair in Pasadena
• Pool Pump Repair & Replacement in Pasadena