jark87
Silver Supporter
- Jun 5, 2011
- 1,308
- Pool Size
- 25500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Aquapure 1400
Ah - that’s a very different issue. Just be sure that you passed all of the SLAM criteria before letting FC levels drop below SLAM levels. Phosphates themselves do not consume chlorine, as the Experts here will tell you that phosphate levels don’t matter if you properly maintain your pool chemistry. If they consumed chlorine, then I think there would be more guidance around keeping them in check. Phosphates are food for algae, so there’s a school of thought that by eliminating the food source, you can prevent algae. The better method is the TFP method where you maintain the proper sanitation levels, which will kill/prevent algae, and then, if you like, use phosphate control as insurance. That’s what I do.The problem was the water was cloudy and eating chlorine like crazy. Even though I slammed it twice.
So if you’re still in a situation where you can’t pass an Overnight Chlorine Loss Test, then you still have an algae problem.

Perform the Overnight FC Loss Test (OCLT)
The Overnight Chlorine Loss Test tells if the SLAM is finished or if you need to start a SLAM. This article says how to do the OCLT.
