SLAM failed OCLT at Mustard Level

[lucasaltic]

Hey all, I had cloudy water and yellow buildup on pool walls and bottom of Home Pool so decided to do a SLAM. Suspected Mustard algae based in reading articles here so decided to take it up to Mustard Algae levels following the conventional SLAM per TF instructions. OCLT passed with flying colors (zero overnight loss at normal SLAM level) so proceeded to Mustard for 24 hours. After the 24 hour period, I decided to run another OCLT. FC was still at Mustard level. There WAS still a little daylight left (~1 hr) when I did my nighttime test but it was cloudy so I didn’t think I would have much drop since it didn’t drop at all in the preceding 1 hour. Retested in the AM and the loss was 4 ppm.

Now, the TF procedure for Mustard Algae SLAM says to maintain at Mustard levels for 24 hours following a standard SLAM, but does not say to check OCLT again. Question is, should I continue the Mustard SLAM for another 24 hours until I pass OCLT again since I did get this data point? Procedure does not say to do OCLT while at Mustard levels. Just hoping to get some clarity.

Thanks.

 

[ajw22]

Procedure does not say to do OCLT while at Mustard levels. Just hoping to get some clarity.

Nope. Don’t make things up that are not in the process.

There is no Overnight Chlorine Loss Test at mustard FC levels.

 

[Mdragger88]

No oclt- just do all the things outlined in the mustard algae article while you’re at MA fc levels.

 

[lucasaltic]

Nope. Don’t make things up that are not in the process.

There is no Overnight Chlorine Loss Test at mustard FC levels.

So one would expect an overnight drop in chlorine at higher levels? Just curious about the science.

 

[ajw22]

So one would expect an overnight drop in chlorine at higher levels? Just curious about the science.

Higher FC levels have higher natural losses.

 

[Mdragger88]

So one would expect an overnight drop in chlorine at higher levels? Just curious about the science.

There’s ALOT of drops involved, with so many there’s more variance in the results. Also higher fc levels drop more quickly- even without the sun.
The ma protocol is just the final blow/insurance- the regular
SLAM Process does most all the work.
If you really think you had MA you may want to also maintain MA minimum fc for a while to be on the safe side.
Fwiw- most people who think they have mustard algae just have regular algae.

 

[lucasaltic]

There’s ALOT of drops involved, with so many there’s more variance in the results. Also higher fc levels drop more quickly- even without the sun.
The ma protocol is just the final blow/insurance- the regular
SLAM Process does most all the work.
If you really think you had MA you may want to also maintain MA minimum fc for a while to be on the safe side.
Fwiw- most people who think they have mustard algae just have regular algae.

Yeah. Probably. Just wanted to be sure because I had SLAMmed about a month prior and the issues recurred along with the yellowish powder on the sides and bottom of the pool. I’ll take your advice and stay at MA maintenance level for several weeks after. Thanks for the clarity.

 

[PoolStored]

There WAS still a little daylight left (~1 hr) when I did my nighttime test but it was cloudy so I didn’t think I would have much drop

For accurate OCLT, you must wait until after sunset. Step 2 in the process.

 

[lucasaltic]

For accurate OCLT, you must wait until after sunset. Step 2 in the process.

I know.