I will send $100 via check, paypal, etc. to whoever figures this out. Driving me mad.
I posted about a year ago on here to see if anyone could figure this out. I've worked with some local companies (No help) as well as Pentair support (My filter company.) No one knows what this is or why it happens.
Some background - this is our fourth summer with the pool. I don't recall noticing this our first summer, but definitely last year and this year. I follow the TFPC methods and the water has always been great, short of something outside of our control. I installed a heat pump our second summer and when I fired it up the first time, I noticed what looked like some grease in the water. I'm guessing I should have run the pump for a few seconds without the heat pump outlet being connected to flush it, but didn't realize it at the time. This was slightly yellow and definitely a grease. It cleared up quickly afterwards. I have also bypassed the heat pump for a week or two in the past and this didn't clear things up at all.
I have an auto-cover, so the pool is almost always closed it not in use. Makes it very easy to care for. There have been times the cover has been closed for a week, pump runs all week, still have the particles. So I don't believe it's anything getting in to the pool from the environment. We had the electronics go on our pump a few weeks ago, so I had the cover open for almost two weeks straight after while I slammed and waited for the FC to come back down. So don't believe it's the cover either.
I run our pump for 7 hours a day and move about 30 GPM.
I put some DE in as our cartridge filter says it can handle that. I noticed a fair amount of DE at the bottom of the pool after adding (To the skimmer.) I brushed it around and all seemed fine. But I thought maybe that meant the cartridge had a hole in it, so I just replaced our cartridge in case. No change.
I'm somewhat out of ideas. It's definitely a white substance, and so small I can't tell if it's hard or what. Almost like specs of dust or paper. It's really only noticeable if you STARE at the water, or if you have the lights on or goggles. Below is a video from my GoPro. Set YouTube to HD.
Only suggestion from Pentair was to clean our SWG. I pulled it out and still just as clean as when I started the pool up. Haven't cleaned it in a few years because there's nothing in there, no build up. Cleaned it anyway, no difference.
Water chemistry -
Borate - Have to re-test this. Brought this up to 50 two summers ago and didn't really notice much, so didn't care to track it or anything.
GOPR0679 - YouTube