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I purchased the 50ppm cya standard from tftest. When I mix the standard with the new 0013 I also purchased, as directed, I can still see the dot when measuring at waist level.

Drop of 3 for the OCLT last night, and the "staining" is fading even more. It is amazing that it does not come up brushing with a steel brush, but after I brush, vacuum, and add sanitizer to SLAM levels, the next day I notice a difference. This must have been a long standing problem I never...

Since joining this forum, my wife thought I became "obsessed" with having a clean pool. I told her that pool maintenance to me is like yoga and meditation to her. She understood, and left me alone after that. TFP is my guru.

Increased SLAM yesterday with higher levels. OCLT loss of 3, but the pool is looking even better than before. The kids used the pool yesterday, and it clouded sightly. Did a thorough stainless steel brush and vac last evening before increasing sanitizer to 31 ppm. Lots of white and gray...

Thanks. I actually think it was an error with the initial test. I just retested 3 times and then did the 50/50 tap water to pool water CYA test , and all tests came out to a cya of 80. This may explain why the water looked a little cloudy after my family and I spent most of yesterday in it.

Before the SLAM, I had a CYA of 50. Using only liquid bleach for the SLAM, my cya is now 80. Can I trust a cya measurement when slamming? Do I need to drain some water and refill?

Another OCLT loss of 4 this morning. Just acid washed the filter cartridges. That was no fun, but the acid water was really nasty. Grayish, brownish milky waste water. The back pressure in my filter dropped about 30%.

Thanks. This past weekend I cleaned the cartridge and scrubbed the housing. I was amazed at how dirty the housing was.

FC loss of 5 overnight. Still going. I cleaned behind the light, which was still clean from the last time I cleaned it, and under the main drain cover, which was dirty and full of dead algae (it's plugged, and non-functional). The cart. filter was cleaned this past weekend. Wondering if it...

Was hoping to end the SLAM today, but had an OCLT of 3 last night... And so it goes. Yesterday was a very windy, rainy day, though, and a lot of leaves blew nto the pool. I really believe I'm dealing with a long established mustard algae problem. I thought I had iron staining in my pool. The...

Well... There goes that theory... FC=14 (loss of 9 overnight) CC= 0.5 The SLAM continues. Today's activities include washing my filter.

Today, looking extremely clear: FC= 18 (overnight loss of 4) CC= 0.5 Seems like OCLT loss results are reducing by half each night. Hopefully I can end the SLAM Sunday, because I'm starting to need to conserve R-0871. I ordered more, but it might not get here before I run out.

Thanks. Yes, hybrid. It's called a Family Fun pool. Main | Family Fun Pools The old paint was very chalky, to the point it was clogging the filter. Many spots were worn to bare concrete. It was acrylic paint, which I discovered by dissolving a paint sample in different chemicals. Then, I...

I moved into this house in 2018, and renovated the pool in April 2019. The person who lived here before stated that the pool light never worked, despite 5 electricians looking at it. The pool was installed in 1987. Whoever installed the light nicked the cord, so the hot wire was exposed and...

Good call! That was probably it.

Much lower FC drop this morning, compared to the 18+ drop the night before. A lot of grayish "dust" settled to the bottom overnight, and the skimmer sock turned a funky blue-green color. FC=12 (loss of 8 overnight) CC=0.5 (barely...there was only the slightest hint of pink that 1 drop cleared...

I decided to buy some Scotch Brite heavy duty scour pads and wipe down my pool. Lo and behold, it removed the dark yellow staining from my returns and skimmer. It also removed staining on my pool bottom and walls that I thought was permanent. I cleaned my waterline tiles, and they look like...