If your pool has stains, algae, or water that won’t stay clear, you may have heard terms like acid wash and chlorine wash—but most homeowners aren’t sure which one they actually need.
While both services are designed to restore water clarity and appearance, they serve very different purposes. Choosing the wrong option can lead to unnecessary wear on your pool surface or higher costs than needed.
Here’s how to tell the difference—and which service is right for your pool.
What Is an Acid Wash?
An acid wash is a deep cleaning process that removes a thin layer of plaster to eliminate:
- Embedded algae
- Mineral staining
- Severe discoloration
- Long-term buildup on plaster surfaces
The pool is drained, treated with a diluted acid solution, then neutralized and refilled.
Best for:
- Pools with heavy staining
- Algae that won’t go away with standard treatments
- Older plaster surfaces with discoloration
What Is a Chlorine Wash?
A chlorine wash (sometimes called a chlorine bath) uses high-strength chlorine treatments while the pool remains filled. It targets:
- Active algae
- Organic contamination
- Green or cloudy water
This method is less invasive and does not remove plaster.
Best for:
- Green pools
- Recent algae outbreaks
- Pools with otherwise healthy plaster
Key Differences: Acid Wash vs Chlorine Wash
Acid Wash
- Requires draining the pool
- Removes surface staining
- Shortens plaster lifespan if overused
- Higher cost
- Used sparingly (every few years max)
Chlorine Wash
- Pool stays filled
- Kills algae and bacteria
- Preserves plaster
- Lower cost
- Often the first recommended option
In most cases, a chlorine wash is attempted before an acid wash unless staining is severe.
Which Pool Cleaning Service Is Right for Phoenix Pools?
Phoenix pools face unique challenges:
- Extreme heat
- High dust levels
- Long swim seasons
- Frequent algae risk
Because of this, chlorine washes and green-to-clean services are commonly sufficient. Acid washes are typically reserved for pools with years of staining or neglected maintenance.
A professional evaluation is the safest way to determine which treatment is needed.
How Much Do These Services Cost in Phoenix?
Typical price ranges:
- Chlorine wash / green-to-clean: $250–$600+
- Acid wash: $800–$1,500+
Costs vary based on pool size, condition, and severity of staining or algae.
Is an Acid Wash Bad for Your Pool?
Acid washes are safe when done correctly—but they should not be overused. Each acid wash removes a small layer of plaster, so frequent acid washing can shorten the life of your pool surface.
That’s why professionals recommend acid washing only when necessary.
FAQs About Acid Wash vs Chlorine Wash
What’s the difference between an acid wash and a chlorine wash?
An acid wash removes surface staining by etching plaster, while a chlorine wash kills algae and bacteria without removing plaster.
How often should a pool be acid washed?
Most pools should only be acid washed every 3–5 years, or less frequently if well maintained.
Can a chlorine wash fix a green pool?
Yes. Chlorine washes are often the best solution for green pools caused by algae.
Do I need to drain my pool for a chlorine wash?
No. Chlorine washes are done with the pool filled, unlike acid washes.
Schedule the Right Pool Cleaning Service
Choosing the right treatment protects your pool surface, saves money, and restores water clarity faster.
If you’re unsure whether your pool needs a chlorine wash, acid wash, or another service, a professional evaluation can prevent unnecessary damage and costs.