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Thread: Algae line on rocks

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    Modawg2k's Avatar
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    Algae line on rocks

    My water-feature rocks have an algae line at water level. Iíve maintained FC levels ~5 and water is nice and clear. Can I just scrub away at the algae line and let the regular FC levels do its job or do I have to slam the pool?


    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    Can you post a picture as I think it's probably a calcium scale line or water/scum line?
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Modawg2k's Avatar
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    Re: Algae line on rocks

    There is some scale too but as you can see there is a line of slimy green algae

    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    Definitely need to hit that with chlorine.

    I have rocks hanging in my pool and I never see that. Does that area get good water circulation? If your pool FC. Is properly maintained at target, stuff like that shouldn't form. My guess is that you have poor water circulation in that area and the FC locally drops too low.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Modawg2k's Avatar
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    Re: Algae line on rocks

    I bet you are right. My pool always has good FC and the water is always clear. However, that area with the rocks has a shallow step area and dirt is always forming there, even w/ the in-floor. Also I notice when a ball or the temp floater gets over there it never really moves away. I guess I just need to manually wash that area with some chlorine on a regular basis
    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    So it's not part of a waterfall or other water feature?


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Modawg2k's Avatar
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    Re: Algae line on rocks

    It's my waterfall, it just has a raised step around right below it.

    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    I see your scale problem on the tile as well.

    Anyway to point a return over by the waterfall, increase circulation somehow? Either that or you might have to make a regular habit of brushing vigorously in that area to get more chlorine over there.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    Do you run the waterfall regularly? I have to run mine at least twice a day for 30mins to ensure enough water flow in the little pools embedded in it or else they can go swamp-green in a day.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Modawg2k's Avatar
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    Re: Algae line on rocks

    i don't run it regularly but maybe I will give that a try to have some fresh chlorinated water run over it. I have my wells setup to where the water completely drains into the pipes so I have no residual water sitting up in the feature. Before I did that change, I had a nightmare of water sitting in those little pools.
    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    JoyfulNoise's Avatar
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    Re: Algae line on rocks

    Quote Originally Posted by Modawg2k View Post
    i don't run it regularly but maybe I will give that a try to have some fresh chlorinated water run over it. I have my wells setup to where the water completely drains into the pipes so I have no residual water sitting up in the feature. Before I did that change, I had a nightmare of water sitting in those little pools.
    Good to know I'm not alone. I'm looking into filling in the little splash pools with stone and cement so that the waterfall goes completely dry when the pump shuts off. It's too much of a pain to take care of the way it is now and I hate having to run the waterfall everyday as it adds to the aeration and pH rise. I don't mind it for pool parties and when the kids play but I prefer not to waste the electricity on pumping water to the falls just to keep algae at bay.

    Good luck with the algae line.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Patrick_B's Avatar
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    Re: Algae line on rocks

    I would mix up a 50/50 solution of bleach and water to spray on that waterline algae. Scrub it when it's dead and make sure you are always good on FC level for your Cya. If you can't keep the water on that area/level it may be something that comes back on you.
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