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Thread: Can SWG run on low pump speed?

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    Can SWG run on low pump speed?

    Now that my pool is about a year old, I'm doing some upgrades that my original PB should have told me about but didn't. My single-speed pump is a bit noisier in the daytime than I like (plus I've read here that a 2-speed pump is more energy-efficient), so I'm going to swap it out for a Hayward 2-speed. My plan is to run it on the low speed for about 12 hours a day (double the time that I'm doing now) and only use the high speed when I'm adding chemicals. My current pump is 1.5 hp, and the new one will be 2 hp.

    I also want to have an SWG installed. I read on this site today that it is best to run them during the daytime when the sun is actively dissolving whatever chlorine is in the water (makes sense). The new PB is going to install a Hayward system good for a 40K gallon pool and is rated to generate 1.4 lbs/day.

    Does it make sense to plan on running the pump at low speed all day? Will that affect the efficiency of the SWG? I don't want to get this done only to find out that I have to run the pump at high speed during the prime part of the day when I want to be swimming - it will be even noisier than it is now! If that's an issue, will it work to run the pump at high speed during the night and on low during the day?

    (if it makes a difference, I have a retractable cover that I usually close each night to retain heat and prevent evaporation.)
    22K 16'x40' inground fiberglass pool, Hayward Pro Series High Rate Sand filter, Hayward dual speed 2 hp Super II Pump, Hayward AquaRite SWG, Raypak 400K btu propane heater, Dolphin Supreme M400 cleaning robot, CoverPool auto cover. Also stand-alone Sundance Hawthorne 430 gallon hot tub.

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    Re: Can SWG run on low pump speed?

    I have a VS pump and my SWG works fine when I run it at 1100rpm which is a pretty low speed.
    10,000 gal Inground Fiberglass Pool;Aquarite SWG; Hayward H Series Gas Heater;
    Hayward Sand Filter; 1.5 HP Hayward Max-Flo VS Pump; Dolphin Pool Cleaner; TF100 Test Kit

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    Re: Can SWG run on low pump speed?

    Each system is different. It should be possible to run at the low speed, but you can't be absolutely sure. I switched from a 2hp Superpump to a 3hp VS pump, and found that I need about 1400rpm to reliably activate the flow switch on my SWG. Others can run at 1000 or 1100 rpm. It just depends on the plumbing of the system.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Can SWG run on low pump speed?

    Can't recall which one, but one of the Mods runs his Pentair at 800 RPM with an SWG and still doesn't trigger a low flow error.
    COMPLETED BUILD THREAD - 15'x29' rectangular offset shotcrete pool; 14,100 gal; 5'x7' raised spa with 400k btu fire feature; 7' spillover; 25' leuder stone raised bond wall w/waterfall; Pentair SWG; Pentair VS (pool); Pentair 3/4hp feature pump; 1hp spa blower; Pentair Cartridge filter; Pentair “Easy Touch 8” wireless; Dolphin Oasis Z5 robot; Solar Hydronics iSwim solar panels; Mansard Screen Enclosure; walnut travertine deck; 1 very happy kiddo.

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    mas985's Avatar
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    Re: Can SWG run on low pump speed?

    Does it make sense to plan on running the pump at low speed all day?
    Not to me. Even 12 hours is too much in my book. I run mine on low speed for about 3-4 hours but that is only for solar. Without solar, I run on high speed for only an hour a day and that is for the cleaner.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Can SWG run on low pump speed?

    Quote Originally Posted by mas985 View Post
    Not to me. Even 12 hours is too much in my book. I run mine on low speed for about 3-4 hours but that is only for solar. Without solar, I run on high speed for only an hour a day and that is for the cleaner.
    I actually have no idea how long I'll have to run the pump – 12 hours was just a guess. Right now I'm running a 1.5 hp pump for 3 hours at night and 3 hours in the afternoon (with no SWG of course). There's a lot of variables that will determine how long the new setup will need to run every day.

    I just wanted to know if others out there have found it possible to operate an SWG with a pump running on low speed, and if that somehow affects the efficiency of the SWG. Apparently it works fine for some and not so much for others. I hope I'm one of the ones it works for – wish me luck, everybody!
    22K 16'x40' inground fiberglass pool, Hayward Pro Series High Rate Sand filter, Hayward dual speed 2 hp Super II Pump, Hayward AquaRite SWG, Raypak 400K btu propane heater, Dolphin Supreme M400 cleaning robot, CoverPool auto cover. Also stand-alone Sundance Hawthorne 430 gallon hot tub.

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    Re: Can SWG run on low pump speed?

    The Hayward SWG's can operate at some of the lowest flows of all SWG's. Most 2-speed pump setups have zero problems for the Hayward SWG's. I have never had a flow issue with my Hayward SWG and I run it 90% of the time on low speed.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Re: Can SWG run on low pump speed?

    The output of a SWG is unaffected by the pump speed, as long as the flow is sufficient to activate the flow switch. With a Hayward T-15 cell you will probably be able to produce enough chlorine in a couple or three hours a day if set at 100%. I prefer running at a lower setting and a bit longer. That allows me to adjust my FC level at the turn of a knob. If you run SWG at full output you need to increase run time instead of just turning the SWG up.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Can SWG run on low pump speed?

    As others said, it depends. Low speed works fine for my SWG, but if the solar turns on, SWG has no flow.
    Phil
    ~9600 gal gunite pool, NEW July 2015; Pentair Intelliflo 2 VST pump; Pentair C&C 150 filter; Pentair Intelliclor IC40 swg; solar heat w/ Pentair Solartouch controller, screened. Taylor K 2005 test kit, FAS-DPD separate test, Taylor K1766 salt test

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    Re: Can SWG run on low pump speed?

    Quote Originally Posted by flipr View Post
    As others said, it depends. Low speed works fine for my SWG, but if the solar turns on, SWG has no flow.
    When your solar turns on your pump should go to high speed, problem solved. Since you have all Pentair equipment, the SolarTouch should be able to control the pump speed. I have SolarTouch and it communicates with my Pentair Intelliflow VS pump.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Can SWG run on low pump speed?

    Quote Originally Posted by chiefwej View Post
    When your solar turns on your pump should go to high speed, problem solved. Since you have all Pentair equipment, the SolarTouch should be able to control the pump speed. I have SolarTouch and it communicates with my Pentair Intelliflow VS pump.
    That is true for VS Pentairs, but Whisperflo 2 speed can't be controlled by Solartouch, so Pentair told me
    Phil
    ~9600 gal gunite pool, NEW July 2015; Pentair Intelliflo 2 VST pump; Pentair C&C 150 filter; Pentair Intelliclor IC40 swg; solar heat w/ Pentair Solartouch controller, screened. Taylor K 2005 test kit, FAS-DPD separate test, Taylor K1766 salt test

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    Re: Can SWG run on low pump speed?

    Quote Originally Posted by flipr View Post
    That is true for VS Pentairs, but Whisperflo 2 speed can't be controlled by Solartouch, so Pentair told me
    That sucks. There should be a relay you could use or some other way to make their pump work with their controller.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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