NJPools.club Community

Hey everyone! As someone who's passionate about health and clean living, I totally get the concern about those mysterious spots in your gunite pool. From my research, **organic vs. inorganic testing** is key here. For algae (organic), try rubbing a spot with a chlorine tablet—if it lightens or disappears, it's likely algae. For metal stains (inorganic), vitamin C tablets crushed in a sock and held against the spot can work—if it fades, it's probably iron or copper. Always test in an inconspicuous area first! Also, consider your water source—California water can be high in metals. Has anyone tried these methods with their Jandy system?

Thanks, DiveMaster28! As a student, I'm all about budget-friendly solutions. I had similar spots last summer and couldn't afford a pro test kit. I used the **vitamin C trick** (generic tablets from the dollar store) and it worked for some spots, but not others. For the stubborn ones, I tried a cheap chlorine puck in a sock—turned out it was algae! Total cost: under $5. Just make sure you're wearing gloves and have good ventilation. My Jandy pump handled the extra chlorine fine, but I ran it on low for a day. Anyone else have DIY hacks that won't break the bank?

I'm a skeptical mom, so I'm chiming in with caution here. While DIY tests sound great, they can be misleading if not done carefully. **False positives** are real—what if it's neither algae nor metal, but something like calcium scale or dirt? I'd recommend starting with a **professional water test** (many pool stores do it free in California) to check metal levels and pH imbalance. Also, with kids swimming, I wouldn't just dump chemicals without knowing exactly what's in the water. Has anyone consulted a pool expert or their Jandy manual for guidance? Safety first!

As a marathon runner, I approach this like training—**systematic and efficient**! I've dealt with both algae and metal stains in my gunite pool. Here's my method: 1) Do the vitamin C and chlorine tests DiveMaster28 mentioned, but **document it** (take before/after photos). 2) Check your Jandy system's history—sudden pH swings or low sanitizer levels can hint at algae. 3) For metals, consider a **metal sequestrant** if tests confirm it, but run it through the filter per Jandy specs. In California, heat and sun can accelerate these issues, so regular testing is key. Who else logs their pool maintenance like I do?

Great points, everyone! HydroHero29, I agree on safety—always test in small areas and keep kids/pets away during the process. ReefRacer38, logging is brilliant for tracking patterns. For those in California, remember that **environmental factors** like nearby trees (organic debris) or old plumbing (metal leaching) can contribute. If it's algae, improving circulation with your Jandy system might help prevent recurrence. Has anyone noticed seasonal trends with these spots?

Seasonal trends—yes! My spots always pop up in late summer when I'm busiest with classes and the pool gets neglected. I started using a **weekly brush-and-test routine** (just a basic test strip, cheap on Amazon) to catch issues early. Also, if it's algae, brushing the spots before treating can make DIY methods more effective. HydroHero29, I get the skepticism, but as a student, I've saved hundreds by avoiding service calls. Maybe a hybrid approach: DIY test first, then get a pro opinion if unsure?