Proper pool chemistry is more than just keeping the water clear – it directly affects swimmer safety, equipment lifespan, and the durability of your pool’s interior finish. In Florida, where heat, rainfall, and heavy pool use are common, maintaining balanced water chemistry is especially critical.
Field Report Findings
Over the past few months, we have come across many pools where the chemistry was so poorly taken care of that it has prompted us to write this post in order to help those who do care about the longevity of their respective pool interior finishes, equipment, and swimmer safety.
The goal of maintaining proper pool water chemistry is simple but critical:
To keep the water chemically balanced so it does not harm swimmers, pool surfaces, or equipment – while remaining clean, clear, and sanitary.
What “Proper” Pool Water Chemistry Really Means
Proper chemistry is not about hitting perfect numbers on a test strip.
It’s about ensuring the water is chemically stable.
A properly balanced pool:
• Does not etch or dissolve plaster, pebble, tile, or grout
• Does not scale or deposit minerals on surfaces, heaters, or salt cells
• Effectively sanitizes bacteria, algae, and pathogens
• Remains comfortable and safe for swimmers
• Extends the lifespan of finishes, equipment, and plumbing
The Three Core Goals of Pool Chemistry
1. Protect the Pool Interior Finish
Unbalanced water can:
• Pull calcium out of plaster or pebble (etching)
• Leave rough, white scale deposits
• Cause discoloration or premature finish failure
Balanced water preserves:
• Surface smoothness
• Color uniformity
• Long-term durability
2. Protect Pool Equipment
Improper chemistry accelerates:
• Heater corrosion
• Salt cell scaling
• Pump seal failure
• Metal staining
Balanced water reduces:
• Repair frequency
• Premature replacements
• Long-term ownership costs
3. Keep Water Safe and Comfortable
Proper chemistry ensures:
• Effective sanitation
• Minimal eye and skin irritation
• Clear, odor-free water
• Reduced risk of algae or bacteria outbreaks
Proper Chemical Ranges
Free Chlorine (FC)
Ideal Range:
-
2.0 – 4.0 ppm (traditional chlorine pools)
-
3.0 – 5.0 ppm (saltwater pools)
Why it matters:
Chlorine is your primary sanitizer. Florida heat and sun burn it off quickly, so running the low end of national ranges often leads to algae and bacteria growth.
pH
Ideal Range:
-
7.4 – 7.6
(Acceptable: 7.2 – 7.8)
Why it matters:
-
Low pH → etching of plaster/pebble, metal corrosion
-
High pH → scaling, cloudy water, reduced chlorine effectiveness
Florida pools trend high pH due to heat, aeration, and salt systems.
Total Alkalinity (TA)
Ideal Range:
-
70 – 90 ppm (most Florida pools)
-
Up to 100 ppm for non-salt pools with unstable pH
Why it matters:
Alkalinity buffers pH. Too high (very common in Florida) causes constant pH rise and scaling.
Calcium Hardness (CH)
Ideal Range:
-
250 – 350 ppm (plaster / pebble pools)
-
150 – 250 ppm (vinyl / fiberglass)
Why it matters:
-
Low calcium → water pulls minerals from the finish (etching)
-
High calcium → scale, especially on tile, heaters, and salt cells
Florida fill water is often calcium-heavy, so CH should be monitored closely.
Cyanuric Acid (CYA / Stabilizer)
Ideal Range:
-
30 – 50 ppm (chlorine pools)
-
60 – 80 ppm (saltwater pools)
Why it matters:
CYA protects chlorine from UV destruction. Florida sun can destroy unstabilized chlorine in hours.
⚠️ Too much CYA = chlorine becomes ineffective.
Salt (Saltwater Pools Only)
Ideal Range:
-
2,700 – 3,400 ppm
(check manufacturer specs — most target ~3,200 ppm)
Why it matters:
Low salt reduces chlorine production. High salt accelerates corrosion and scaling.