Recent content by 33Mike

Update: I obtained a new face plate, tension, ring, and gasket. I removed the light from the niche and disassembled it. This allowed me to do a bit of a post mortem. It looks like the significant corrosion was on the inside surface where the gasket meets the back of the face plate. The...

Yes, TA has been consistently around 120 +/- 10 ppm. I usually keep the pH around 7.4 and it seems to stay there without the addition of some acid. The higher TA but lower pH put the CSI in the slightly negative range. I know the TFP suggestion is to have the TA much lower and pH slightly...

Thanks for the reply. I took out the light again today to further inspect it. For some reason I had in my head that it couldn't be rust. Surely a $100 trim ring would be made of the finest stainless steel available! When I pulled it out of the niche there wasn't any algae behind it but there...

I have a fiberglass pool with a Pentair Intellabrite 5G spa light. After a year or so of owning the pool I started to see some rust colored junk on the face plate of the light. I removed the light from niche to clean and unleashed a giant plume of algae. After lots of scrubbing on the pool...

There seem suggestions to the contrary. This PDF says: "When testing for cyanuric acid with a melamine-based turbidity test, the most significant interference is water temperature. High temperatures, above 90 °F, can result in readings as much as 15 ppm low. Low temperatures, below 60 °F, can...

Thanks to both of you for your replies. I hadn't heard of the tennis ball technique. I take it this is supposed to trap oils floating on the water. Good to know. We've now had 2+ inches of rain in the last day or so and the water on top of the cover appears to be clear. I will recheck my FC...