Added products we probably shouldn’t have…now what?

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Sure. Looks like dirt or grime of some kind. Not algae or pool related that I can see.
 
mknauss said:
Sure. Looks like dirt or grime of some kind. Not algae or pool related that I can see.
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Chlorine levels were at 30ppm last night, this morning it was 27ppm. Now at 1pm it's 17ppm. Is it normal to drop 10ppm that quickly or is there potentially something else going on? It is finally sunny here today but I didn't think it would drop THAT much with the sun...

Also, the chemicals that I posted at the very beginning of this thread... would those have anything to do with the build up of black stuff?
 
FC can drop pretty quickly when well above Target level for your CYA.

Those products should not create a black goo.
 
I'm late to this thread so all the filtering done should have already taken care of the white stuff on the bottom of the pool. I would suggest that it was phosphate precipitate from the phosphate remover you used. When you add the phosphate remover to the pool, it will get a cloudy white if there was phosphate in your pool. Only a pool test before you added the remover would confirm that you had high phosphate levels. Low FC levels, not phosphates, lead to algae. You likely didn't need to add it but since it was done, the result was phosphate coming out of solution in the water. If enough time goes by, some of that will fall to the bottom of the pool. The white residue you saw could be the phosphate. You could vacuum that out of the pool. But as I said, it is likely already filtered out at this point in time.
 
Homebrewale said:
I'm late to this thread so all the filtering done should have already taken care of the white stuff on the bottom of the pool. I would suggest that it was phosphate precipitate from the phosphate remover you used. When you add the phosphate remover to the pool, it will get a cloudy white if there was phosphate in your pool. Only a pool test before you added the remover would confirm that you had high phosphate levels. Low FC levels, not phosphates, lead to algae. You likely didn't need to add it but since it was done, the result was phosphate coming out of solution in the water. If enough time goes by, some of that will fall to the bottom of the pool. The white residue you saw could be the phosphate. You could vacuum that out of the pool. But as I said, it is likely already filtered out at this point in time.
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Ok thanks! We did have high phosphates as that was tested at the pool store wayyyy in the beginning before I started following TFP but we didn't add anything for the phosphates at that time. It did turn cloudy when we added the phosphate remover. Would that also be the cause of the black stuff though?
 
mknauss said:
FC can drop pretty quickly when well above Target level for your CYA.

Those products should not create a black goo.
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When do you know a salt cell is going bad? Or is it possible we still have algae… it’s a new pool this year and when we inspected the salt cell about a month ago it was totally clean looking. At the beginning of the year before we had to deal with the mustard algae we were hovering at 15-20% for our salt cell output. Since we stopped SLAMing I kept it at 50%. 10/2 here were all my numbers and that’s when I turned the salt cell back on:
FC 7
CC .5
pH 7.4
Alkalinity 70
Calcium 310
Salt 3,800
CYA ~30 maybe a little less

The pump randomly turned off in the middle of the night after this test (this is the 3rd time that has happened…PB coming to look on Tuesday) and I woke up to the FC at 4.5ppm so I dumped a little liquid chlorine in as I didn’t want it to drop below 6 as I was just overestimating my CYA to 40.
10/3 - 1:05pm it was 8ppm FC. I forgot to log 10/4 but it was fine and we left for a two night trip. My FIL logged these:
10/5 - 8:30am FC 7.5
10/5 - 2pm FC 8
10/6 - 8:50am FC 6.5

Then I logged these:
10/6 - 11:30am FC 6
10/6 - 4:04pm FC 5

At this point I bumped up the cell to 75%…I feel like with our autocover it shouldn’t have to be up this high. It is hot out (80 degrees) but our cover is closed and the temps drop to 50 at night and all summer we always had it below 50% output. Is the salt cell going bad already? Something wrong with the pump? Any ideas? Thanks!
 

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TinFoilHat said:
How many hours do you run your pump?
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24/7. But it looks like the issue is the algae wasn’t totally gone even though my SWG did actually maintain 6ppm all day today but when I looked this afternoon there was some spots on the bubblers. I’m ready to throw in the towel. I have been attempting to SLAM for a month now and passed multiple overnight tests on the latest one. I have scrubbed so many pool toys with a multi purpose bleach cleaner twice and breaking my back brushing the pool a million times a day. At mustard algae SLAM levels last time I took all the removable parts off to pool and scrubbed them with a brush too. Cleaned the filter multiple times. I don’t know what else I could have been doing better or different this last SLAM I did. We have a cartridge filter so we can’t backwash. Does this stuff die off over winter and what do I do if it’s not gone before we close up in a month? The two spots where it is the water line will be drained below it because the bubblers are on the sun shelf and there's a spot on the second step.
 
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