Hi all,
About a month ago the water got a bit cloudy and I had OCLT of about 1ppm. The chlorine was below target level, so I decided to do a normal SLAM. Water was crystal clear already on the second day, OCLT showed 0 ppm loss. So I thought I was done. A few days later I did discover something that looked like pollen in one corner that I could easily brush off with my hand, only for it to reappear within 3-4 days, brushed it off again, appeared again.
Fast forward 2 weeks after the initial SLAM, Chlorine dropped below target level again. I figured that I had the SWG too low for the summer. So I did another SLAM. Same thing, pool cleared up, 0ppm overnight loss at the SLAM level. And to be on the safe side I increase the SWG output from 40% (2.2ppm) to 60 (3.3ppm), to make sure that this definitely wasn't the issue.
About 1 week later, the water got cloudy again and OLCT is again at around 1-1.5ppm and drops below target level overnight. The SWG is not able to produce enough during the day while it runs, so the water gets cloudier by the day. I did a few days of supplemental 3ppm liquid chlorine just to see if that helps, but that only slowed the cloudiness progress.
In addition my CYA level dropped 20ppm within 1 month. No draining, just regular splash out and a bunch of good rain showers in the past weeks. (overflow is closed)
Latest Test this morning after the overnight loss.
- FC: 2ppm
- CC: 0.5ppm
- TA: 80ppm
- CH: 400ppm
- CYA: 40ppm
- PH: 7.8
My two guesses:
- Mustard algae that is not killed by a regular SLAM?
- Does Mustard algae eat CYA? I heard some bacteria can? Or does a SLAM somehow reduce CYA? Or do I have two separate problems?
I want to make sure I get it right this time. Any recommendations?
About a month ago the water got a bit cloudy and I had OCLT of about 1ppm. The chlorine was below target level, so I decided to do a normal SLAM. Water was crystal clear already on the second day, OCLT showed 0 ppm loss. So I thought I was done. A few days later I did discover something that looked like pollen in one corner that I could easily brush off with my hand, only for it to reappear within 3-4 days, brushed it off again, appeared again.
Fast forward 2 weeks after the initial SLAM, Chlorine dropped below target level again. I figured that I had the SWG too low for the summer. So I did another SLAM. Same thing, pool cleared up, 0ppm overnight loss at the SLAM level. And to be on the safe side I increase the SWG output from 40% (2.2ppm) to 60 (3.3ppm), to make sure that this definitely wasn't the issue.
About 1 week later, the water got cloudy again and OLCT is again at around 1-1.5ppm and drops below target level overnight. The SWG is not able to produce enough during the day while it runs, so the water gets cloudier by the day. I did a few days of supplemental 3ppm liquid chlorine just to see if that helps, but that only slowed the cloudiness progress.
In addition my CYA level dropped 20ppm within 1 month. No draining, just regular splash out and a bunch of good rain showers in the past weeks. (overflow is closed)
Latest Test this morning after the overnight loss.
- FC: 2ppm
- CC: 0.5ppm
- TA: 80ppm
- CH: 400ppm
- CYA: 40ppm
- PH: 7.8
My two guesses:
- Mustard algae that is not killed by a regular SLAM?
- Does Mustard algae eat CYA? I heard some bacteria can? Or does a SLAM somehow reduce CYA? Or do I have two separate problems?
I want to make sure I get it right this time. Any recommendations?