Great Readings...but still Algae???

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A

Andrew

0
Jun 9, 2010
6
Long Island, NY
I love the TFP and the BBB method! I've been using it for years and I always tell people about it, and they give me weird looks. That's OK -they can keep spending hundreds of dollars at the pool store and still have a horrible looking pool!! They just don't understand the chemistry.
Anyway, my situation is this:
In ground Vinyl liner pool, 18x36, with a DE filter which runs 8-10 hours per day.
Water readings are:
FC 15
CC 0
TC 15
PH 7.5
T/A 100
CH 110
CYA 90
Temp 84

I think the readings are pretty good but I still get a light film of green algae that I can't get rid of. The TC is high because of shocking to get rid of it but it seems very stubborn and comes back. I do brush it and shock with bleach but I don't understand how it could possibly be present with that CL level. The CYA is a little high because of the CL pucks I use occasionally for some stabilizer. The CH is a little low, but I'm not concerned with the vinyl liner. Any ideas or solutions to get rid of the algae for good are appreciated. Thanks!!
 
It appears you are not getting your FC high enough to completely kill your algae population due to your high CYA.

Check your FC numbers with the pool math calculator.

I'm guessing you will either need to raise your FC shock levels or lower your CYA.
 
So happy that you like the methods used here.

That is a really high CYA. Do you have one the recommended kits (Taylor K-2006C or TF-100)? If so, your CYA could be higher than 90. Please redo this test diluting the sample so we can be sure of your CYA level: Pool School - CYA

Also, what is your location? Can you update it on your profile? It helps us make better recommendations... like what CYA level would work best. While you are at it can you update your signature with your pool details. Pool School - Read This BEFORE You Post

With visible algae, you need to SLAM to get rid of it. Pool School - SLAM - Shock Level And Maintain

Unfortunately, you will probably need to replace some water to get your CYA level lower, but we won't know how much until you verify your CYA level.
 
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