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Thread: schedule for back washing

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    schedule for back washing

    Advice is to backwash before pressure up 25%. For this old filter / glass that would be 1.25 * 17 or 21.

    So have been watching the pressure and it never goes up. Finally yesterday after 3 months I saw 19 so backwashed.

    The water was really brown. See pic below.

    Pool water is clear.

    Questions
    1) I suppose should just bwash q month regardless of pressure. True?
    2) Why does pressure not rise in this old device?
    3) Since the water was so dirty, was I actually filtering anything? Or just putting debris back into the water and wasting pump electricity $$?

    Thank you.
    Attached Images Attached Images
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Mod Squad jblizzle's Avatar
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    Re: schedule for back washing

    Sand filters catch more debris as they get dirtier. If you have oversized filter and low debris, backwashing only a few times a year could be normal. Was the pool nit not clean?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Mod Squad tim5055's Avatar
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    Re: schedule for back washing

    Quote Originally Posted by engrav View Post
    Advice is to backwash before pressure up 25%. For this old filter / glass that would be 1.25 * 17 or 21.

    So have been watching the pressure and it never goes up. Finally yesterday after 3 months I saw 19 so backwashed.

    The water was really brown. See pic below.

    Pool water is clear.

    Questions
    1) I suppose should just bwash q month regardless of pressure. True? No, False
    2) Why does pressure not rise in this old device? As Jason is suggesting it is probably a little oversize for the pool, which is the best way to go. Larger filter smaller pump (within reason)
    3) Since the water was so dirty, was I actually filtering anything? Or just putting debris back into the water and wasting pump electricity $$? No, Sand filters actually filter better as they get dirty as strange as that may seem. The dirt becomes extra filter media.

    Thank you.
    See answers in red
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: schedule for back washing

    Quote Originally Posted by jblizzle View Post
    Was the pool nit clean?
    not sure what "pool nit" is, sorry
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Richard320's Avatar
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    Re: schedule for back washing

    Quote Originally Posted by engrav View Post
    not sure what "pool nit" is, sorry
    It's a typo. Reread it substituting not for nit.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: schedule for back washing

    Quote Originally Posted by tim5055 View Post
    1) I suppose should just bwash q month regardless of pressure. True? No, False
    ok, will just follow pressures

    thank you
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Mod Squad jblizzle's Avatar
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    Re: schedule for back washing

    Quote Originally Posted by Richard320 View Post
    It's a typo. Reread it substituting not for nit.
    Thanks, Richard
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: schedule for back washing

    Quote Originally Posted by Richard320 View Post
    It's a typo. Reread it substituting not for nit.
    got it, yes water is clear
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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