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Thread: Water boatmen / water beetle attack! What can I do?

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    Water boatmen / water beetle attack! What can I do?

    Yesterday I hunted and smashed about 8 of these little swimming nightmares. Most of the time they were swimming directly at me as I ran away trying to find a net to capture them. I read that they usually feed on algae so I did an OCLT last night and didn't lose anything at all, so I don't think that's the problem. I also checked the ladder and scrubbed the pool (my poor arms) down really good. So assuming the problem isn't algae will they just go away on their own? Or is there something I can do to get them to avoid the pool? I live about 2 blocks away from a lake, so that may be a contributing factor. I wouldn't really care all that much, I've made peace with the tree frogs, but they bite and I often have my niece in the pool with me and don't want her getting bit. Thanks!
    26' Intex 17k gallon above ground pool. 3000 GPH intex sand filter. Taylor Tech. k-2006 Test kit.

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    DaninFLA's Avatar
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    Re: Water boatmen / water beetle attack! What can I do?

    not much to do unfortunately other than what you are doing. even with no algae they are still going to be around, since they like water. high FC from what I have read is hit or miss. borates apparently have limited success.

    I have heard they are transient, so just a matter of waiting for them to move on...or until you kill them all.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Water boatmen / water beetle attack! What can I do?

    I am not sure if this is something you would like to do or not but I believe bats eat them. It may be worthwhile to build a Bat house. At night if I turn my pool light on and the beetles will start landing on the water and the bats just swoop down and get them. This also helps because the beetles at my place I believe lay eggs in the grass which turn into grubs which in return attract moles that completely destroy my yard.
    25,000 gallon in ground white plaster- 1 1/2 HP Pentair SuperFlo pump - 60 sqft FNS DE filter (with FiberClear), 1999 Sundance Optima 850 hot tub.
    Manassas Park, VA

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    DaninFLA's Avatar
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    Re: Water boatmen / water beetle attack! What can I do?

    Quote Originally Posted by Rocco View Post
    I am not sure if this is something you would like to do or not but I believe bats eat them. It may be worthwhile to build a Bat house. At night if I turn my pool light on and the beetles will start landing on the water and the bats just swoop down and get them. This also helps because the beetles at my place I believe lay eggs in the grass which turn into grubs which in return attract moles that completely destroy my yard.
    you see, this is why I love TFP. where else are you going to go and get a recommendation to build a bat house. awesome. sounds really cool too, would love to see bats regularly, they are fascinating animals.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Water boatmen / water beetle attack! What can I do?

    If they have nothing to eat, they will leave. elevate your chlorine to twice the level called for in the FC/CYA chart for a few days and you will kill off the organic material they are feeding on and they will leave.
    Most of the time they were swimming directly at me as I ran away trying to find a net to capture them.
    I don't think they are QUITE that aggressive but the mental image you gave me is vivid.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    DaninFLA's Avatar
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    Re: Water boatmen / water beetle attack! What can I do?

    Quote Originally Posted by duraleigh View Post
    If they have nothing to eat, they will leave. elevate your chlorine to twice the level called for in the FC/CYA chart for a few days and you will kill off the organic material they are feeding on and they will leave. I don't think they are QUITE that aggressive but the mental image you gave me is vivid.
    nope, I think a bathouse is the way to go, and should be THE TFP recommended solution.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Water boatmen / water beetle attack! What can I do?

    Quote Originally Posted by duraleigh View Post
    If they have nothing to eat, they will leave. elevate your chlorine to twice the level called for in the FC/CYA chart for a few days and you will kill off the organic material they are feeding on and they will leave. I don't think they are QUITE that aggressive but the mental image you gave me is vivid.
    I will try it, thank you sir! Also, it could be that my current was dragging them toward me but it was enough to get a high pitched squeal out of me. Now your mental image is more vivid.

    - - - Updated - - -

    Quote Originally Posted by Rocco View Post
    I am not sure if this is something you would like to do or not but I believe bats eat them. It may be worthwhile to build a Bat house. At night if I turn my pool light on and the beetles will start landing on the water and the bats just swoop down and get them. This also helps because the beetles at my place I believe lay eggs in the grass which turn into grubs which in return attract moles that completely destroy my yard.
    I'm kind of scared of bats but maybe this could be my origin story?

    - - - Updated - - -

    I have also read dawn dish soap causes a film on the top of the pool that will essentially drown them all, although it doesn't last. Any truth to this?
    26' Intex 17k gallon above ground pool. 3000 GPH intex sand filter. Taylor Tech. k-2006 Test kit.

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    Re: Water boatmen / water beetle attack! What can I do?

    I get one or two from time to time but they seem to go away.

    I like the bat idea... Lots and lots of bat houses... heh, heh, heh... The wife would have a heart attack!
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    Re: Water boatmen / water beetle attack! What can I do?

    I've had success with Dave's recommendation to raise the CL level to get rid of them. I'm not sure if one has bitten you yet, but they are painful little suckers!
    Replastered 2015: Sunstone Quartz Midnight Blue 16x32 rectangular gunite with in-pool spa....18,000 gallons. Autopilot Total Control System with SWG and acid pump. Pentair Clean & Clear 420. Auto cover. TF-100.

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