Pool Acid Wash in Northridge, CA

A pool acid wash in Northridge makes sense when stains or scale sit on top of plaster that is still in good shape. We drain the pool, wash the surface in sections with diluted acid, neutralize the rinse water and refill, which strips off the stained layer and leaves a cleaner finish behind.

Since acid removes a fine layer of the finish each time, we only recommend a wash after seeing the pool in person.

Pool Acid Wash in Northridge: What Makes It Different

Scale here starts at the tap. LADWP groups Northridge with its San Fernando Valley communities, served by Los Angeles Aqueduct water, local groundwater and State Water Project supplies, and in 2025 those Valley sources averaged 103 to 140 mg/L of hardness. (Source: LADWP) Summer evaporation keeps concentrating that calcium between top-offs until it coats the plaster.

Many properties are older, too. Housing in ZIP codes 91324 and 91325 has a median build year of 1970 (Source: U.S. Census Bureau ACS via Census Reporter), and an older pool has had more seasons of scale, algae episodes and chemical swings written into its surface.

There is also the ground itself. Northridge gave its name to the magnitude 6.7 earthquake that struck at 4:30 a.m. on January 17, 1994, and the U.S. Geological Survey says the shaking heavily damaged communities throughout the San Fernando Valley. (Source: U.S. Geological Survey) A drained pool is the best chance to look closely at the shell, so if we see a crack, we show you exactly where it is and what it needs.

What's Included in a Northridge Acid Wash

• Stain diagnosis. We sort out whether the marks are organic, metallic or mineral and probe for thin or loose plaster.
• Planned discharge. Chlorine removed and the water sent only to an allowed discharge point.
• Section-by-section wash. Acid applied, watched and rinsed quickly.
• Shell walk-through. Surface, fittings and tile line looked over while the pool is empty.

Our pool acid wash overview compares washing with other stain treatments and lays out the full method.

Drain Rules and Refill Chemistry for a Northridge Pool

The city's stormwater ordinance, which covers Northridge, allows pool discharges only after the chlorine or bromine has been removed, and it never allows commercial or public pool filter backwash into storm drains. (Source: Los Angeles Municipal Code) For a pool acid wash in Northridge, that means dechlorinating the water before it goes anywhere near the street and neutralizing the acid rinse water first.

The refill matters as much as the wash. Industry start-up guidance for plastered pools calls for total alkalinity of 80 to 100 ppm and pH of 7.2 to 7.6 (Source: Pool & Hot Tub Alliance), and we aim for the same targets on a freshly washed surface so hard Valley water does not etch or scale it right away. Tile and calcium cleaning, handy while the pool is empty, is listed on our homepage.

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 Northridge:

• Pool Acid Wash in Encino
• Pool Acid Wash in Woodland Hills
• Pool Acid Wash in Sherman Oaks

Other services in Northridge:

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