Pool Chemistry Checker
For Fiberglass Pools
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AI advice based on fiberglass pool manufacturer guidelines. Not a substitute for professional service.
Protect Your Investment
Your pool is one of the biggest purchases you'll ever make.
A fiberglass pool is a $50,000–$100,000 investment. Bad water chemistry doesn't just make swimming unpleasant — it permanently damages your gelcoat. Think of it like never changing the oil in a new car. By the time you notice the problem, the damage is already done.
What bad chemistry does
- Fades and stains the gelcoat
- Creates rough, chalky surfaces
- Causes blistering and osmotic damage
- Voids your manufacturer warranty
What good chemistry does
- Keeps your gelcoat glossy for decades
- Prevents costly resurfacing ($10K+)
- Makes swimming comfortable and safe
- Protects your warranty coverage
The good news? It only takes 5 minutes a week to keep your water right.
Fiberglass vs. Concrete
Why your pool needs different chemistry
Your pool store's advice is probably for concrete pools. Here's why that matters.
| Parameter | Fiberglass | Concrete |
|---|---|---|
| pH | 7.2–7.4 | 7.4 – 7.6 |
| Free Chlorine | 1–3 ppm | 1 – 3 ppm |
| Total Alkalinity | 80–120 ppm | 80 – 120 ppm |
| Calcium Hardness | 0–120 ppm | 200 – 400 ppm |
Fiberglass Pool Care
Learn why fiberglass pools need different chemistry
Understanding Your Water
Most Common
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