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Thread: Blowing out returns

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    TrevNJPool's Avatar
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    Blowing out returns

    I have a Hayward multi selector valve on my sand filter. It has filter, winter,waste, backwash, recirculate and rinse. What setting do you put it on when your ready to blow out the returns? There is no valve to blow directly in the line so its going to have to go thru the multi valve.
    40x18 Lazy L Rectangle
    29500gal IG w/ vinyl liner
    HAYWARD S244T 300lb sand filter
    Hayward Super Pump 1 1/2hp

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    Re: Blowing out returns

    recirc will work
    30000 gal inground vinyl liner;sand filter w/glass media, nuvo uv, TF-100 test kit; 25 years on Baquacil, converted to TFP chlorine in 2016

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    Catanzaro's Avatar
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    Re: Blowing out returns

    As pookiesunshine mentioned "Recirculate" will work. Please remember to take out the sight glass, pressure gauge, drain plug on the bottom. Here is a link for the sand filter.

    Winterizing your Sand Filter

    Interesting to note: Hayward Manual for the S244T 24" 300# sand filter, states only this in their instructions for winterizing:

    WINTERIZING (Same for other sand filters with multi-port)

    1. Completely drain tank by unscrewing drain cap at base of filter tank. Leave cap off during winter.

    2. Depress Vari-Flo control valve handle and rotate so as to set pointer on valve top between any two positions. This will allow water to drain from the valve. Leave valve in this "inactive" position.

    winterizing with a sand filter

    - - - Updated - - -

    There is no valve to blow directly in the line so its going to have to go thru the multi valve.
    Where exactly is there no valve? In the filter pump housing or the filter/multi-port?
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Re: Blowing out returns

    Can someone confirm. If a shop vac isn't enough to blow out the lines can you install a 1/4 npt fitting in the drain hole of the strainer and back flow compressed air through the system. Would the multi-port still need to be in recir?
    Thank you
    Gary
    New Haven, CT
    16 x 32 x 8 in-ground vinyl , sand filter
    22,000 gallons
    Leslie test kit, TF100 test kit

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    Catanzaro's Avatar
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    Re: Blowing out returns

    Quote Originally Posted by gtr1999 View Post
    Can someone confirm. If a shop vac isn't enough to blow out the lines can you install a 1/4 npt fitting in the drain hole of the strainer and back flow compressed air through the system. Would the multi-port still need to be in recir?
    Thank you
    The multi-port is better on recirculate as it creates less resistance than on filter which involves the sand. Both methods work. What exactly do you mean by "back flow compressed air" through the system? Maybe someone else will chime in, but I tried my shop vac before and had no success. Maybe others have had better success. The shop vac will work if you lower the water below the return jets, etc. There will be no friction. If you have a main drain, that is a different story. I do not recall if anyone has ever used a shop vac and had success with the main drain. There have been posts with some pressure figures needed to blow out the main drain based on pipe size and length, etc.

    I know people have had great success with an air compressor. I personally have the Cyclone which is specifically designed for pools.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Re: Blowing out returns

    1st off my apologies to Trev I don't want to hijack this thread but the information would be the same topic and may help.
    With my pool the return lines-(2) on each end of the pool are about the same level as the bottom of the skimmer inlet so when I drain the pool the water level should be below all of them. This is my first time closing I should add in so I'm not an experienced winterized yet. The previous owners left the 16 gallon shop vac they used to blow out the lines so I will try that first. I do have a 3 hp compressor with 60 gallon tank that I can wheel over to the filter and use. Looking at the strainer assembly there are 2 drain plugs that appear to be 1/4npt. My thought was if I plugged in the air line to that port the air will flow into the filter and the opposite direction to the skimmer or main drain inlet lines. There is a multi position ball valve at the junction of the skimmer and main drain inlet lines to the skimmer. My system doesn't have separate ball valves for the skimmer or main drain. The return line from the filter to the pool must split under the pool somewhere to the (2) return eyeballs.

    Speaking of the main drain is there any way to blow it out and seal it? Without a ball valve on the main drain line how to hold an air pocket in it and how long will that last?

    Again I can start a separate thread if needed but I have been watching for any closing threads to review them. My water is about 70* now so another week and I should be about ready to close.

    Thank you
    Gary
    Gary
    New Haven, CT
    16 x 32 x 8 in-ground vinyl , sand filter
    22,000 gallons
    Leslie test kit, TF100 test kit

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    Catanzaro's Avatar
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    Re: Blowing out returns

    Next time, please start your own thread regarding the Hi-Jacking.

    Gary:

    The previous owners left the 16 gallon shop vac they used to blow out the lines so I will try that first.
    Contact the previous owner and find out what he did. That simple, especially with the 16 gallon shop vac.

    I do have a 3 hp compressor with 60 gallon tank that I can wheel over to the filter and use. Looking at the strainer assembly there are 2 drain plugs that appear to be 1/4npt. My thought was if I plugged in the air line to that port the air will flow into the filter and the opposite direction to the skimmer or main drain inlet lines.
    You can actually close the Multi-port valve off and no air will travel that way or you can use a rubber expandable plug (like I use) to close off the return side in the pump housing basket.


    There is a multi position ball valve at the junction of the skimmer and main drain inlet lines to the skimmer. My system doesn't have separate ball valves for the skimmer or main drain. The return line from the filter to the pool must split under the pool somewhere to the (2) return eyeballs.

    Speaking of the main drain is there any way to blow it out and seal it? Without a ball valve on the main drain line how to hold an air pocket in it and how long will that last?
    This is the easy part. Close off the main drain. Take your shop vac and suck the water out of the skimmers first. Then go back and blow the remaining water out which should be very easy (This is what I do) and as the compressor is blowing all the water out of the skimmers (you can even close one at a time) to help out, use your shop vac and keep sucking any water out. Then shut off both units for now. Now install the first Gizmo. Go to the other skimmer and remove the Gizmo and start blowing air through that one while sucking up the water. When done shut everything down again. Install the next Gizmo.

    Now go back to the pump housing and open the main drain. Blow air in the main drain until the water bubbles at the surface for 45 seconds to 1 minute (depending on how powerful the blower is) and quickly close the valve at the main drain and you will hear the "air lock". Open the basket and add a rubber plug to the suction side so if the valve fails you have added protection.

    Winterize your filter:
    Winterizing your Sand Filter (same as other sand filters with multi-port)

    Interesting to note: Hayward Manual for the S244T 24" 300# sand filter, states only this in their instructions for winterizing:

    WINTERIZING

    1. Completely drain tank by unscrewing drain cap at base of filter tank. Leave cap off during winter.

    2. Depress Vari-Flo control valve handle and rotate so as to set pointer on valve top between any two positions. This will allow water to drain from the valve. Leave valve in this "inactive" position.

    winterizing with a sand filter


    I am actually going to start a new thread explaining each step (in detail) so each post can be linked. Pool closings are very easy if you have the right blower, plugs and shut off valves for skimmers, main drains and returns.

    Please keep us posted!
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Re: Blowing out returns

    Thank you and again my apologies on the thread.
    Gary
    New Haven, CT
    16 x 32 x 8 in-ground vinyl , sand filter
    22,000 gallons
    Leslie test kit, TF100 test kit

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