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Thread: Getting my bearings (and, green pool)

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    Join Date
    Aug 2014

    Getting my bearings (and, green pool)

    Hi all,

    Just discovered this forum after desperately searching for ideas on what to do with a green pool. Looks like I have much learning to do - Pool School reading, test kits to buy, etc...

    Just before I plunge into this, one question. Background: I have been running with a green'ish pool for a few weeks now, after a major rain. I managed to get the water somewhat cloudy, not too green, but then I had to leave last weekend, and I kept the pump off. Now the pool is QUITE green. My pool store told me maybe my sand was old (I bought the house in 2011, and it's just at that shoulder period where I don't know if the previous owner changed sand after 5 years, or was lazy and didn't)... anyway, I changed the sand a week ago myself. Worst experience ever. Sand everywhere. But I digress.

    Here's the question. When I attempt to vacuum the algae out, they come back to the pool. My jets are mostly on one side of the pool. What happens is, if I start vacuuming to waste (like if the pool is too full), the water clears up; but then if I switch the filter to "Filter", and continue vacuuming, the muck gets returned to the pool right in the area of the jets. I can see them excreting the stuff I'm vacuuming back in. Is this normal behaviour that will go away once I figure out my CYA, shock the pool and fix the water balance? I verified my laterals when I emptied the sand, and they were perfect - no cracks or funny business. I filled the filter with 6 bags of 50lbs of regular sand.

    As far as the green-ness goes, I guess I have no choice but to buy a test kit and see if my water is completely out of whack, so I'll go ahead and get on that.


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    bobodaclown's Avatar
    Join Date
    Apr 2011
    Lakeland, FL

    Re: Getting my bearings (and, green pool)

    Welcome to the forums.
    It's pretty simple really, Algae grows in the water so you've got to kill the algae. The forums here recommend using chlorine (bleach), it can be in gas from from a SWCG, liquid (Bleach or pool chlorine), or solid (Cal Hypo or such). Liquid or gas form don't add other chemicals that need to be dealt with.

    The filter catches the dead algae, and the pump makes it all work.

    That's it in a nut shell.

    Algae multiply at an incredible rate. With no chlorine in the pool they'll quickly come back.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Lakeland Florida

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Getting my bearings (and, green pool)

    +1 what bobodaclown said. You cannot get rid of algae with a filter. Chlorine kills algae and then you filter your water clean.

    read "The ABC's of Pool Water Chemistry" up in Pool School.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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