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Thread: Residue on top of water, could it be CYA?

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    Samantha_in_AL's Avatar
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    Residue on top of water, could it be CYA?

    I noticed Saturday that I have a slight residue on top of my water, which is otherwise sparkling clear. It looks like tiny little patches of a powdery/oily looking substance. The filter doesn't seem to be removing it. (Sorry I don't have a picture to post, I'm at the office right now) I placed pantyhose on the skimmer basket this morning to see if that would help remove it.

    I've been adding CYA (granular) over the past few days as it was zero when I opened the pool. Due to some unsolicited help from my impatient daughter, I'm pretty sure we have overshot it a bit.
    Could the residue be from the CYA? I'm not sure if this matters, but I'm still using out of a bucket that's three years old. Could that be a problem? I didn't notice the residue being there before I started adding CYA.
    AG 18' X 52" Round Pacifica Pool w/ Metal Diamond Unibead Liner. Installed in March 2007.
    2.5 HP Baquapure 2 Speed Pump, 200 GPM Waterway ProClean Cartridge Filter System.


    Former Baquacil user
    Converted to BBB in Fall of 2009 - Now I have a truly trouble free pool!

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    JasonLion's Avatar
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    Re: Residue on top of water, could it be CYA?

    No, it couldn't be CYA. It is most likely some kind of organic oil coming out of the pollen that is common this time of year, or perhaps suntan lotion if you have been swimming.

    Chlorine will break it down eventually. A simple thing to try would be a scum bug/scum ball in the skimmer to gather it up. If it bothers you, and stays around for more than a couple of days, you could use an enzyme treatment to speed up it's breakdown.
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    Re: Residue on top of water, could it be CYA?

    If you are really worried about having added too much CYA, I suggest you rinse you cart(s) today in case there is still some undissolved CYA sitting there dissolving...
    20k gallon free form plaster pool with a spill over spa, sand filter, Master Pools in floor cleaner, Jandy PDA and Jandy Lite2 natural gas heater.

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    Samantha_in_AL's Avatar
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    Re: Residue on top of water, could it be CYA?

    Thanks for the quick reply Jason, I guess it would have to be pollen. No one has been swimming in our pool yet this year.

    Andrew, I will rinse the cartridge as soon as I get home. I called home and had someone shut the pump off. Geez, I wish I'd thought of that yesterday when I realized too much CYA had been added.
    AG 18' X 52" Round Pacifica Pool w/ Metal Diamond Unibead Liner. Installed in March 2007.
    2.5 HP Baquapure 2 Speed Pump, 200 GPM Waterway ProClean Cartridge Filter System.


    Former Baquacil user
    Converted to BBB in Fall of 2009 - Now I have a truly trouble free pool!

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    Samantha_in_AL's Avatar
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    Re: Residue on top of water, could it be CYA?

    Jason, I'm now 100% sure the residue was organic because I woke up to a slightly green tinted pool this morning. I immediately started shocking.

    Also, I was relieved to find out that my daughter didn't really add any extra CYA, she was just "messing" with me!
    Teenagers...... that's a whole other topic. LOL
    It probably wouldn't have mattered that much if she really had added it considering the flooding rains we get here in the spring. I'll probably need to add more in a few days after tonight and tomorrow's storms move through.
    AG 18' X 52" Round Pacifica Pool w/ Metal Diamond Unibead Liner. Installed in March 2007.
    2.5 HP Baquapure 2 Speed Pump, 200 GPM Waterway ProClean Cartridge Filter System.


    Former Baquacil user
    Converted to BBB in Fall of 2009 - Now I have a truly trouble free pool!

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