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Thread: low speed filtering and scrubbing

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    Diver's Avatar
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    low speed filtering and scrubbing

    Iím on a 3rd season of my pool ownership. The first season I had a single speed pump and it was uneventful. The pool was pristinely clean, once a week I would use a robot-cleaner to clean the pool and that was it. I switched to slow speed filtering on my 2nd year.

    This current season I had a problem with solar cover and after I got rid of it everything seemed to be fine, except few green spots on the liner. The chemistry is spot on and a friendly push with a brush would get rid of the green spots. The spots seemed to be powdery Ė I didnít actually had to brush it, I could simply push some water towards them and they would disappear with a poof..

    I contemplated the idea that it couldíve been the pollen, but Iím pretty sure itís algae.

    Aside from very light brushing every day or every other day, everything seemed to be fine.

    My understanding is that with change from normal speed to slow speed filtering I lost some of the circulation that now allows for some spotty algae growth. I used to filter 5-6 hours on high and now I do 10-12 hours on low. So the turnaround is about the same, but the exist velocity for jest is lower.

    My question is Ė is a normal routine for low speed filtering? I think some people brush all the time, but I didn't had a need for it before. I think filter time increase will not fix this, I simple have to brush here and then from now on.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Mod Squad Bama Rambler's Avatar
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    Re: low speed filtering and scrubbing

    Have you ran an OCLT to see if it was organics? If you haven't, you should.

    Maybe you need to change the eyeballs or just re-aim them to get better circulation. Running the robot should also help.

    Can you post a full set of test results?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/ľhp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Diver's Avatar
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    Re: low speed filtering and scrubbing

    Bama Ramber,

    That was a quick response. The pool is closed right now, but as I mentioned the chemistry was in check. Here are the numbers that I had before I closed:

    CYA: ~30
    FC: 4-6
    CC: 0
    TH: 180
    PH: 7.5
    TA: 100
    Borates: 35

    OCLT always passes. I do have eye balls with slightly large opening for better flow. I could try to use the old ones with small opening. I tried playing with eye ball direction, but it didn't seem to have a significant impact.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    linen's Avatar
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    Re: low speed filtering and scrubbing

    Have you tried ping pong balls on the surface to see what circulation pattern you are getting? It might show dead spots.

    You may have to go with the smaller eyeballs to get the velocity up now that you are running on low. I would try it at least.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Diver's Avatar
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    Re: low speed filtering and scrubbing

    the corners seem to be problematic for surface circulation since i see the sunk debris there, but the eye balls will not turn that far. the green spots don't seem to have a pattern that i can understand. it just seems anywhere below 4 feet is a fair game for them.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Mod Squad Bama Rambler's Avatar
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    Re: low speed filtering and scrubbing

    You could put a 90ļ elbow on a return or two and then put the eyeball in it and turn it along the wall. Maybe that would help.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/ľhp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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