Mustard frustration

[caljw]

Include me in the ranks of those battling mustard algae, in the shallow.shady end of pool. A couple of years ago I posted about re plaster issues I had with my contractor. Marbling and pitting shortly after the job, it's in this area of the pool I am now fighting mustard for the second seasno. Have shocked at 24, brushed daily and within days the algae was back. FC levels one week after shock still high at 9.

pH 7.5
TA 90
CH 350+ (high since botched plaster job)
CYA 40
Borate 50

Is the faulty plaster an issue? Not ready to add copper....have a great success with TFP!
Thanks.

 

[duraleigh]

read "How to Shock Your Pool" up in Pool School....it doesn't sound like you are following that process.

 

[JasonLion]

Pitting does create small areas with bad circulation, which can harbor algae and are difficult to brush properly.

Have you seen the article on fighting mustard algae in Pool School?

 

[caljw]

OK...going back to re read the shock and mustard treatment methods. Will report back. Thanks.

 

[Richard320]

You know what to do.

If it was me.... when I added the bleach to take it up to MA shock level, I'd try to pour it in that area, and then quickly scrub that wall with a wall whale brush.

That flap converts the backwards-forwards motion you provide to some serious downward pressure that should get into some of those pits a little better.

 

[caljw]

Thanks Richard...appreciate your encouragement. Re checked the CYA higher than I thought at 60. So the FC is now at 34, brushed and filter running overnight and through tomorrow. Will keep FC at 34 for 24 hrs. Lights removed and brushed also.

 

[caljw]

Cleared! After a Memorial Weekend battle the mustard algae is gone. Thanks for getting back on right track (shock/TA).
Question: at what FC levels on the way down from 34ppm does my Ph test become effective?

 

[Butterfly]

Cleared! After a Memorial Weekend battle the mustard algae is gone. Thanks for getting back on right track (shock/TA).
Question: at what FC levels on the way down from 34ppm does my Ph test become effective?

10

Congrats! Pics! Pics!

 

[caljw]

Thanks. Will try and get some after pics...don't have any before but the steps are clean and white, hope it lasts

 

[Richard320]

Party at JW's house!

Maintain FC and you may never have to go through the shock process again.

 

[caljw]

Re: Mustard frustration..it's back!

Dang. After a few day the mustard started to reappear. FC levels were maintained at shocks levels(34) per pool calculator for 48 hours. FC has not dropped below 6 ppm since. Running out of R-0871 and patience....