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Thread: First back wash

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    Join Date
    Jun 2015
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    McDonald, TN
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    First back wash

    FC= 21.5
    CC= 5.5
    TC= 27
    ALK= 100
    CYS= 95

    We are on the recovery side of a very Green Pool. This morning I back washed the pool after filtering all night. I then topped off the pool to operating level. Now I'm back to filtering. Our plan is to bring the CYA level down by back washing a couple of times a day then adding water a little at a time until the water clears up.


    20000 / vinyl / in-ground / Hayward s200 high rate sand filter/ Century 1 HP pump.

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    Richard320's Avatar
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    Re: First back wash

    You could also just vacuum to waste to lower the water level and avoid loading up the filter with any sludge you pick up off the floor. Just turn the dial to waste. It will send the water straight out the backwash line and bypass the filter completely.
    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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    Mod Squad kimkats's Avatar
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    Re: First back wash

    What he said ^^^^^^^^^^^^^^^^

    Glad to have you back Richard!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: First back wash

    Good evening all, Today just completed draining 3 ft. of water to waste. 3 pm. readings: Ph=7.4 FC=12 CC=0 TA=80 CYA=35. 3:30 PM. Added 2 gal. 8.25% Chlorine, Brushed pool. Tested again at 9:00 PM. PH=7.4 FC=12 TA=90 CYA=35.
    Added 2 gal. 8.25% Chlorine. Lets see what tomorrow brings... Thank all of you for your support......Lou
    20000 / vinyl / in-ground / Hayward s200 high rate sand filter/ Century 1 HP pump.

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    Re: First back wash

    How's it going?

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    Re: First back wash

    Hey Marian, Things are looking good. Let me start from the start of my SLAM procedure.
    7/29/15 Started filling pool: Added 4 Gal. 8.25% Bleach. 7/30/15 Added 2 Gal. 8.25 % Bleach.
    7/31/15 Pool is full. Ran pool on filter for 2 hrs. Tested water PH= 7.4 FC= 8.5 CC= 0 TA= 80 CYA = 35. At 3:30 PM I added 2 Gal. 8.25% bleach. At 9:00PM Tested water: PH= 7.4 FC= 12 CC= 0 TA= 90 CYA= 35. 8/1/15 9:30 AM. Backwashed Filter & Swept pool. 11:00 AM Water Test. PH= 7.6 FC=12 CC= 0 TC=12 Ta=80 CYA=35. Added 2 Gal. 8.25% Bleach. 1:00 PM Added 1 1/2 cups Acid to lower PH. Tested water at 10:00PM. FC=12 PH=7.4 TA=80. Aug. 2, 2015 Water Test 11:30 AM: FC=13.5 CC=0 TC= 13.5 . PH=7.4 TA=80. At 2:15 PM I vaccumed to waste some sedement from the bottom of the pool. At 7:45 PM added 1 Gal. 8.25% bleach. At 8:45 PM tested water: FC=15 CC=.5 TC= 14.5. Will record the OCLT results in the morning.IMG_2550 ‎Today, ‎August ‎2, ‎2015, ‏‎8 hours ago Almost don.jpg
    Last edited by sadowlou; 08-02-2015 at 09:02 PM. Reason: Wrong photo attached
    20000 / vinyl / in-ground / Hayward s200 high rate sand filter/ Century 1 HP pump.

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    Re: First back wash

    Woot!!! Love that clarity!!! gorgeous!
    That is after/before, right?

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    Re: First back wash

    Aug. 3, 2015
    Hey Marian, 6:45 AM. OCLT= 22 Drops (10ml) FC= 11.
    7:15 AM. added 1 Gal. 8.25% bleach.
    8:20 AM. FC= 29 drops/R-0871 FC= 14.5
    cleaned baskets, and brushed pool.
    8:30 PM. added 2 Gal. 8.25% bleach.
    9:30 PM. FC=17.5 CC=0 TC=17.5.
    Will test OCLT in the morning.
    If the OCLT is not in proper range we will replace the sand in the filter. Sand is about 6 years old.
    20000 / vinyl / in-ground / Hayward s200 high rate sand filter/ Century 1 HP pump.

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    Mod Squad zea3's Avatar
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    Re: First back wash

    You shouldn't need to replace the sand in the filter. What you can do is deep clean the sand and break up any clumps. Remove the access dome and gently poke a water hose down into the sand. Try to avoid hitting the laterals. Let the water from the hose flow into the filter so dirty water and gunk flows out the top. Pull the hose out and re-insert an inch away and let the dirty water flow out again. Repeat this process over the entire surface of the sand bed. Once it has been cleaned put the top back on and set the multiport to rinse. Rinse the sand for a couple of minutes to re-seat the sand bed, and then set it back to filter.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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