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Thank you all, I finally passed the OCLT after 8 days!!! - I actually ended up doing nearly 24 hrs bc of thunderstorms. FWIW - it seemed to go very slowly and then sped up at about the time I added CYA. Would having CYA under 20 have somehow slowed down the process? (I measured exactly 20...

Thanks. Am still going. Does adding CYA reduce the FC that shows up in the test?

Is 3 PPM normal for a covered pool? I had thought it was more like 1? I'm not yet passing the OCLT although I guess it depends on how many hours the test is supposed to be for. This morning I lost the least yet at 1.5 but that was for about 12 hours. At this point it feels like progress so...

BenB I'm not sure I understand what you mean. If they are reducing the FC doesn't that mean there is exposure? Then when it stabilizes then whatever algae is sanitized?

Thanks Should I add CYA now or wait till the FC is stable?

So I've been slamming since Wed and my pool is still absorbing Chlorine. My CYA readings are now closer to 20, did add some water. Am just wondering if my CYA is too low for SLAM and would it work better if I raised it. Most of the time the pool is covered. Honestly its crystal clear and...

yeah I have one of those robots precisely for that reason. am trying to run it multiple times a day as a substitute

One more question - I have wrist issues which keep me from brushing the pool all the time, will SLAM still work but just take longer? I can be patient as long as eventually it will work.

I think my method was just wrong on the first test - I wasn't getting deep enough in the water so maybe was just getting surface water which was lower FC. This would explain why my test and the test at Leslie's both showed 1.5. It didn't make any sense to me bc I'd boosted for nearly two days...

Also I dug up my pool's paperwork to get exact measurements and think that was my main error. Basically if I don't include the spa and sun shelf area - then it becomes a 35X20, depth of 3-7 (i had thought it was 8) - pool calculator says 18750 gallons. Am I right to exclude the sun shelf and...

Apologies, I incorrectly stated what I added- it was 7 cups, 56 oz

wireform - no I'm not using a speed stir, I just heard about this yesterday and don't have one

Thanks all. I added 7oz this morning and again FC went up by 3. I'm just wondering now if my pool size is off. It is 45X20 but has a 10 ft long (w steps) sunshelf on one side and a 10X10 spa on the other. It is 8ft maximally deep and the sun shelf is 1 ft. How many gallons do you think this...

Thanks all, very helpful hints. I suspect I messed up the first time I did it and so it was under reported. Definitely seems the deeper I stick my hand the higher the FC level. Just to clarify - one person said to do by a return and one never by a return? (BTW a return is a skimmer...

4)is there a best way to scoop the water? wondering if maybe i'm getting too much surface water vs deep.

I've been holding the drops mostly sideways. Can definitely do upside down, once it came out too fast so I switched. I can certainly be making a mistake, maybe it was with the first reading, but it seems to be impacting every reading. What is the best practice technique? 1)Do you have the...

mknauss - if not higher concentration, what else explains the big rise? could something in the water cause that?

I added another 4 cups and this time FC went up 2-3 but this included some time with the cover off and full sun so I could add the liquid chlorine. Just helps to confirm that I think the Leslie liquid chlorine (labeled "super shock") is just higher than expected. Will report back tonight...

Hi all, I used the 10ml sample. So some new info has given me an idea of why it jumped. This morning I added 4 cups of the liquid chlorine and an hour later my FC went up 3-4. This was from a new bottle (used up the first gallon yesterday). Interestingly that rate is basically the same from...

So measured this morning and the FC is down about 2 (from 27 drops to 23 drops). So does that mean I should keep adding more liquid chlorine this morning? If so, how much given the reaction I got last time. The SLAM chart says around 13 for CYA of 35. Using pool math that's almost half a...

I got the liquid chlorine from Leslies - at least the label says 12.5% As for my pool, it is 20 X 45 (will measure again tmw but at smallest its 20*40). It does have a 10X10 spa inside so maybe I should subtract that. I also think its certainly possible I did the test wrong as it was the...

I did put the automatic cover back on right after I added the chlorine so not sure if that somehow trapped it more.

Thanks all. I am trying to follow the suggestions but got some weird readings that I'm struggling to make sense of. Before I added 1 gallon of liquid chlorine 12.5% my FC was at 1.5. Then an hour after adding it, it was at 13.5. Based on the Pool Math calculator for a 30000 gallon pool it...

Sorry I just read your link, guess I need to do that test to figure out the algae issue. Thanks a ton!

Thanks so much. I just got my TFTestkit in the mail so tested the CYA and it looks like its 35 (not 50 as Leslie's had said). Do you think I need a higher CYA even if it remains mostly covered? I run it for 8 hrs a day @ 45% for the pool, 15% for the spa, but I did boost it 48 hrs ago...

Hi, I have a Jandy aqua pure SWG and even after boosting I can't seem to get the chlorine up. The pool has an automatic cover on it and so rarely gets sunlight except when actually used (1-2X a week). I cleaned the cells (which did have a little scale) but still nothing. My CYA is reading near...

I appreciate your perspective but that’s not what CoverStar says. They say it can hold up to NE winters for concrete pools. At this point, I’m going to try it for winter and see. Water is lowered below the tile line, but higher in the spa where I’ve put a small submersible pump that I turn...

Thanks. Coverstar, the autocover makes, says it can withstand New England winters but they don’t warranty it. They also say lower it to inch below the tile. Doing that definitely makes a sag but hopefully not too big a deal. Another idea someone gave me is to just leave it open during the...

Thanks much for the responses so far. Pls see the picture - there is tile on both exterior walls of the spa and on the side is a sun shelf On lowering the water, Coverstar says you need to lower the water to one inch below the tile line - assuming so they don’t take liability for any popped...