Small algae outbreak.

[Ted Y]

After firing my pool guy due to high CYA levels causing frequent algae outbreaks, I convinced my skeptical wife I could take care of it myself and save us money. I did a full drain and refill.

I found this site and got a TFTest kit. Today, my wife found three spots of fuzzy green algae right above the waterline on the pebble tech where the water wicks up the pebbles. I bought this was odd. Is it?

Truthfully, I probably haven't been as good about testing and adding chlorine as I should, about every other day. I already brushed the pool. I didn't test the chlorine before bringing up to shock level. I was never seeing any OCL drop.

Here are my current test results:

pH 7.5
FC 16.0
CC 0.0
TA 100 (was 150)
CH 260
CYA 40

I am using BBB method. The algae was about a total of 24 inches long along the waterline in those three spots combined. Thoughts? I will be doing the shock method in pool school. The water has always looked crystal clear, i have never shown more than 0.5 CC and have never seen any OCLT. I will post up results at dark and again in the morning.

We get a solid 12 hours of sunlight per day, 100+ air temps, water temps are 84-90 already, and it has been windy lately.

 

[duraleigh]

right above the waterline on the pebble tech

If it was above the waterline, the chlorine can't completely get to it. Mechanically remove it and plan on brushing the pool sides from time to time.

Mine gets that all thetime if I don't brush.

 

[Ted Y]

Well that makes me feel a little better. The stainless steel brush took it right off. The shock level should do its work.

 

[duraleigh]

The shock level should do its work.

Perhaps, but keep in mind the chlorinated water doesn't prevent much above the waterline....you're still gonna' have to brush.

 

[Ted Y]

I just meant the chlorine should kill the green algae I just brushed off the wall into the pool water. I knew what you meant. I have been brushing below the waterline and will now brush all the way up to the top. Thanks

 

[Ted Y]

For hours later and my FC is still 15.

 

[Richard320]

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[Ted Y]

As of 05:15 this morning, my Free Chlorine is still 15. Water is crystal clear. I think I got it killed before it got bad. Thanks everyone.

Can I assume that I can let the FC drift back down to normal our stay at shock level longer?

 

[duraleigh]

Can I assume that I can let the FC drift back down to normal our stay at shock level longer?

I think you got it, too. I would let the FC drift back down to maintenance levels as you suggest.