Troubleshooting
Why Is My Pool Foaming?
Pool foam almost always traces back to something you (or a product) put in the water, not a chemistry emergency. Here's how to find the source and clear it up.
Why Do My Eyes Sting After Swimming in My Pool?
Stinging eyes almost never mean too much chlorine. Here's how to tell whether pH or combined chlorine (chloramines) is the real cause, and what to do about each.
Why Is My Pool Cloudy After Rain?
Rain dilutes your chemistry, washes in debris, and can shift your pH all at once. Here's why that clouds the water and the order to rebalance it in.
Why Is My Pool Cloudy After Shocking It?
Cloudy water after a shock treatment is usually a normal, short-lived side effect, but it can also point to a filtration problem. Here's how to tell the difference.
What Is Chlorine Lock and How Do You Fix It?
Your chlorine reads fine but the pool still turns cloudy or green: here's what "chlorine lock" actually means, why it's almost always a cyanuric acid problem, and the two real ways to fix it.
Black Algae vs. Green Algae: How to Tell the Difference and Treat Each
Black algae and green algae look nothing alike under the surface and need different brushing and dosing approaches. Here's how to identify which one you have and treat it correctly the first time.