Water level low? Algae on my Lytro legend

[jRom]

I read somewhere that water level should be half of skimmer opening. Mine is about half way from the Lower tile. So I should add more water right?

Does water evaporation reduce CYA levels?

I pulled my pool sweeper out to clean the bag and there was some green algae on it? Should I be concerned?

Any advice would be great

Thanks

 

[Richard320]

Yes, no, yes.

Algae on anything that was in the pool indicates insufficient chlorine.

If your CYA is real high, your FC needs to be real high, too, often higher than the testblock can read and guaranteed higher than what the pool store recommends as they tend to ignore the FC/CYA relationship. Pool School - Chlorine / CYA Chart

Ideally, you'll SLAM Process your pool to eliminate any algae spores. It might only take a day to pass the three tests if you caught it fast enough.

 

[Donldson]

Does water evaporation reduce CYA levels?

No. Technically evaporation raises CYA but since the water is refilled it effectively stays the same. The only ways to reduce CYA (aside of waiting for months or years for it to break down) is to pump out water and replace with fresh water or reverse osmosis.

 

[jRom]

Thanks RIchard and Donldson.

So after reading Richard's advice I measured my FC Level, it was 8.0 at around 10:00 am. So I added 121 oz Clorox bleach 8.2% and turned my filter on to circulate the Chlorine. Measured about 3 hours later at around 1:00 pm and FC 11.2.

At around 10 pm I remeasured everything

FC 8.6 forgot to measure CC
pH 7.8
TA 80
CH 250
CYA 120 (did 50/50 tap water and pool water)

So I lost about 2.6 ppm of Chlorine which is in line with the average from what I have read in the forums that between 2-3 ppm of Chlorine loss/day is normal.

I added another 121 oz of Clorox at 10:45 pm, turned the pump on to cirulate the water.

at 12:45 am Measured FC at 11.8.

Will measure in the morning to see if I pass ONCLT and then I guess if it fails I will SLAM the pool. Thought I would try this first before Slamming as my CYA levels are so high I would need to maintain my FC at 39, that's alot of Chlorine...

During the day and went and bought some HASA 12.5% Chlorine at a Pool Supply store $18.99 for 4 Gallons. I was using Clorox I bought from Costco but the way I'm going through it hate throwing away all the plastic gallon bottles away. I bought (2) boxes 3 bottle 121 oz for $9.99.

During the week I was adding a bottle every 2 days to keep my FC levels up around 8. So already used 4 bottles, thinking if I use higher % Chlorine I wouldn't have to put so much in. But haven't really calculated the cost ratio of which is better. Clorox or Hasa. Need to re-read that post on how to calculate %chlorine/$.

Thanks, will let you guys know if I pass ONCLT tomorrow.

 

[jRom]

So checked my FC the next morning and it was FC 11.0. So only loss 0.8 PPM of chlorine. So I passed the ONCLT?

Pool looks great, water is clear.

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