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Thread: Black Algae & Pump Run Time

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    Modawg2k's Avatar
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    Black Algae & Pump Run Time

    I battle black algae every year at the beginning of the pool season it seems like with my pebble surface (probably due to cold weather FC neglect). I have my FC elevated and I am performing manual brushing.

    I normally run high speed for about 3 hours, and then low speed anywhere from 5-8 hours to maintain a TFP salt water recommend FC level in the early evening. Should I be increasing my low speed pump time to promote greater water flow over the black algae areas throughout the day? Or does pump run time not really matter as long as I'm maintaining an elevated FC all day?
    ~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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    bobodaclown's Avatar
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    Re: Black Algae & Pump Run Time

    Brush, brush, brush! Seriously you can't brush enough. I'm in a similar situation. I can't brush enough. Once you get it clean, no black spots visible, always maintain your free chlorine level on the high side. And brush!
    Brushing will promote mixing. No need to increase pump run time, unless you've got a SWCG and need the additional time to make more chlorine.

    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 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Modawg2k's Avatar
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    Re: Black Algae & Pump Run Time

    Quote Originally Posted by bobodaclown View Post
    Brush, brush, brush! Seriously you can't brush enough. I'm in a similar situation. I can't brush enough. Once you get it clean, no black spots visible, always maintain your free chlorine level on the high side. And brush!
    Brushing will promote mixing. No need to increase pump run time, unless you've got a SWCG and need the additional time to make more chlorine.
    I do have a SWG but I can maintain an good FC level with a lower pump run time and higher output.
    ~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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    bobodaclown's Avatar
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    Re: Black Algae & Pump Run Time

    You're using a stainless steel brush not nylon correct? Maintain on high side based on CYA level. Also review this: Pool School - Black Algae
    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 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Modawg2k's Avatar
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    Re: Black Algae & Pump Run Time

    Quote Originally Posted by bobodaclown View Post
    You're using a stainless steel brush not nylon correct? Maintain on high side based on CYA level. Also review this: Pool School - Black Algae
    Oh yeah. I have both a steel brush attachment for my pole and a smaller steel brush attachment which I throw on some goggles and scrub by hand.


    ~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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    bobodaclown's Avatar
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    Re: Black Algae & Pump Run Time

    I feel your pain.
    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 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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