mustard?...sorry long post

[mneal]

I think I have mustard, it was slimy yellowish. I couldn't sleep last night so I re-brushed it again. This am. the water looks pretty much clear/normal. We got a ton of rain last night and I vacuumed and pumped it into yard since I had to drop water level anyhow. I found the post about distilled water and I checked the Cl this am. and it is 6-7, however accuracy????? I am planning on going to PS to get more Cl this am. and will have them check it. Since water is clear should I keep the Cl at shock level? I will not let them sell me any Cu based algicides. We live in SW Florida and there is a storm looming in the Caribbean so I am off to do hurricane prep searching on this wonderful site. I am betting the answer involves bleach. :-)
************************************************** ************************************************** ******************
Back from PS:
TC:5.0
FC:5.0
CC:0
pH:7.8
Acid Demand: 3
TA:80
Calc Hardness: 205
CYA:50
TDS:400

Should I keep adding Cl to rise the level to shock even though water looks clear?

[duraleigh]

With that nice Cl level of five (your dilution method was fairly close....that's good) and a CC result of zero, it sounds like your good to go. If you keep your Cl level in a 3-6ppm range and look for visible signs of poor water quality, I see no reason to shock.

I am betting the answer involves bleach. :-)

Yep, it will!! :-)

[matt4x4]

Please read these other posts.

http://www.poolforum.com/pf2/showthread.php?t=5612

[mneal]

This morning I brushed pool and I had slight yellow mustard (I guess that s redundant) on one wall. I checked water yesterday and CC was 4.0. PH was 8.0 so I added 1 cup acid. . This morning CC was 3.0 and pH was 7.7 so I added 1/2 cup more acid. We have people coming by today for BBQ/pool party so I didn't want to shock it yet...is that dumb? I just added a slight (pint) of chlorine and I will shock it tonight. Is I will keep an eye on chlorine today in case the algae is gobbing it up.

[gordyjamz]

Use the polyquat. It worked for me. Got the tip from one of the threads here, and it worked. Thing is, this year its seems the little buggers won't go away with a shock level of cl, so I tried the polyquat algacide. It did cloud up the water once it was killed, but I used a floc to let it settle to the bottom. Vacummed it to waste, and presto, no more algae since beginning of August! Have had clear water since.

[Simmons99]

Polyquat may help - but it really works better as a preventative measure. If it is mustard algae - it will go until you shock to the level appropriate for your CYA level. Then you need to hold it there until the algae dies and the pool clears.

My understanding is that mustard algae is harder to kill than most - so clorine is really the key.