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Update... I opened the pool on a Sunday and this year it took until Friday to see any noticeable changes in the swamp. After Friday, I began to get consistent improvement daily. I finished the SLAM this past Friday so I think I was just shy of 2 weeks to SLAM. Also, something new I did new...

Thanks for the replies. I've opened to a swamp several times. Some even worse. Never had one just not respond like this.

Using liquid 12.5% Adding it 3 x daily. Tested CYA again about 30 minutes ago. It's right at 50.

Overnight, I lose 2-3 FC. From 6:30-5:00 I lose 12 FC. It's been warm and sunny, low 80's.

3 times a day. 6:30am, 5pm, 11pm.

I am 4 days into the SLAM process and am seeing no real improvement. Pool is still a green swamp. Before starting the SLAM, I tested everything and adjusted the pH to 7.2, CYA was at 50 and started the SLAM with a FC of 20. The sand filter is reading 0 psi but this has happened before due to...

Last fall when we had the pool winterized, they found that one of the skimmers had a failed gasket between the faceplate and the liner of the pool. They had to lower the water level to below the skimmer to blow out that line. This summer the pool companies I contacted suggested against pulling...

The pool is about 8 years old with the original liner. The walls are not metal, but plastic. There is a sun deck so we normally do not drain any water at closing. I have several sand bags on the sun deck to help keep the liner against the wall when the water was lowered. I'm sure the water...

Had the pool closed and they found a leak behind one of the skimmer's faceplate. They dye tested to find this leak. In order to finish the closing, they dropped the water level to below the skimmer, blew out the lines, added antifreeze and installed the gizzmos. One skimmer has its aquador...

Had to wipe away another layer of black slime in just one of the skimmers today. Took some new measurement also. FC 7 CC 0 pH 7.2 CYA 40 CH 125 TA 50 Salt 4200 I finished the SLAM about 6 days ago but have been afraid to raise the CYA because I was battling a never ending SLAM last summer and...

I keep getting a ring around the inside of my skimmers just above the water line. I brushed it clean last night and after work I came home and it came back strong in one skimmer and just a few specks in another. It feels like slime but not sure if it may be black algae. What could I be...

Went outside to look around the jets with the lights on and a flashlight. Pump was off and the water was calm. No algea around the jets. I unscrewed the jet directional nozzle and it is clean behind this and around the inside of the jet. My guess is algae is hiding behind the faceplate of...

I have been testing for ONCL at night when it is completely dark, around 11 or midnight, then in the morning when it's getting light out but the sun is not visible in the sky. It's the combination of the chlorine loss and the dusting of algae along the seams of the liner each morning that makes...

Thanks for suggestions. I do have a corresponding thread there "Long SLAM now this". I have posted my #'s there. I will be updating that thread from here on out. I appreciate everyone's input.

FC would typically drop by 1 point each night. Would a dead tree overhanging our backyard be causing this? It has already dropped most of its leaves. But could it be dropping spores or other small particles that may be consuming chlorine? It is not directly over the pool but is 20-30 ft tall...

I tore everything apart to clean this thing. I took off the skimmer doors, removed the main drain covers and cleaned inside the drain, behind the lights, removed light lenses and cleaned algae from there, deep cleaned the sand filter, cleaned the umbrella post hole in the sun deck. I brushed...

I have removed the lens covers from the lights and cleaned every inch of the pool. I still can't pass an ONCLT even at mustard level slam. Out of liquid shock. Ready to call this summer a failure.

I still can't pass an ONCLT as I am loosing 1 part every night and am seeing a dusting of algae along the seams and any depressions in the floor of the liner. I did a couple days at regular slam levels and then the rest of the week at Mustard level slam. No change each morning. I ran out of...

I received the o-rings from SR Smith. I removed and cleaned the lenses and buttoned everything back up. Time to SLAM it again. I hate to think of what I've done to the liner this year while SLAMming the pool so long this year. I took a few before and after pics of the lights. I'm hoping...