Light algae on walls

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bware

bware

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Platinum Supporter
Apr 7, 2015
142
The Woodlands, TX
Have reoccurring dusting of algae on pool walls and hot tub. Just tested and don’t see anything way out of range. See below:
Ph 7.8
Fc 5
Cc 0
Ch 400
Ta 90
Cya 80
Temp 80
Salt 2950

doesn’t make any sense to me but what do I know. Any thoughts from the pros?
 
Well, pollen and dust would sink to the bottom. Before we assume the worst (algae), you might just kick-up that FC level for today with some liquid chlorine and get it up to about 8-10 ppm. Try to keep it elevated like that all day today. Then run an Overnight Chlorine Loss Test this evening with the SWG off about 30 before grabbing the first FC sample. See if you are experiencing a large FC loss overnight.
 
Texas Splash said:
Well, pollen and dust would sink to the bottom. Before we assume the worst (algae), you might just kick-up that FC level for today with some liquid chlorine and get it up to about 8-10 ppm. Try to keep it elevated like that all day today. Then run an Overnight Chlorine Loss Test this evening with the SWG off about 30 before grabbing the first FC sample. See if you are experiencing a large FC loss overnight.
Click to expand...
Sounds like a good plan. I’ll have to do this tomorrow as I won’t be around tonight to take samples. I’ll report back afterwards. Thx for the info.
 
Texas Splash said:
Well, pollen and dust would sink to the bottom. Before we assume the worst (algae), you might just kick-up that FC level for today with some liquid chlorine and get it up to about 8-10 ppm. Try to keep it elevated like that all day today. Then run an Overnight Chlorine Loss Test this evening with the SWG off about 30 before grabbing the first FC sample. See if you are experiencing a large FC loss overnight.
Click to expand...
Should pump be running during the OCLT? Thanks!
 
bware said:
Should pump be running during the OCLT? Thanks!
Click to expand...
If you are doing an OLCT alone and not as part of an actual SLAM Process, then the pump simply needs to be on for about 30 minutes after adding the last chlorine dose at night and before grabbing the sample. Once you get the night water sample, you can turn it off. In the morning, the pump needs to be on for about 30 minutes before grabbing the morning sample to mix everything well again. I have a 2-speed, so I just leave mine on low all night to not worry about it. :)
 
Texas Splash said:
If you are doing an OLCT alone and not as part of an actual SLAM Process, then the pump simply needs to be on for about 30 minutes after adding the last chlorine dose at night and before grabbing the sample. Once you get the night water sample, you can turn it off. In the morning, the pump needs to be on for about 30 minutes before grabbing the morning sample to mix everything well again. I have a 2-speed, so I just leave mine on low all night to not worry about it. :)
Click to expand...
👍Thanks!
 
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