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Thread: Dialing in pump/filter run time

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    Dialing in pump/filter run time

    Let me apologize in advance if this is posted in the wrong forum. I'm attempting to dial in my pump/filter run time in order to get it to the lowest amount of time possible and still turn the water over once a day. The quandary I have is I don't know for sure what pump I have. As near as I can determine it is a Sta-Rite Dura-Glas P2RA5EL. I don't know this for sure, but working with Pentair and looking at the pump flow curve sheets they sent me for the Max-E-Glas/Dura-Glas pumps I think this is what I have. Using figures posted by mas985 on other threads I "think" I have a system head of about 65 feet which would put this pump at about 50GPM. Is there a way to find my flow for sure that doesn't involve buying expensive gauges or is it going to be one of those best guess type scenarios? Below is the information I used to come up with my numbers...

    Pump Make/Model: Sta-Rite Dura-Glas (fairly sure) P2RA5EL (best guess based on fact that it is a 1hp motor with a 1.25 SF
    Filter Type and backwash valve model if known: Hayward S244T with a Vari-Flo XL Control Valve
    Filter PSI reading at the desired valve settings and pump full speed: New gauge reads 16psi on clean sand when in filter position
    Optional: Pump suction reading (in-hg) - not necessary but improves accuracy: Would be more than happy to provide this if someone could tell me how
    Heater: No
    Pool/Spa valve: No

    Suction side plumbing system description: 1 run of 1 1/2" pvc. Pump is about 15 feet from the pool, there are 3 90's and a wide mouth skimmer in the run. Pump is about 2 feet below pool water level.
    Return side plumbing system description: 1 run of 1 1/2" pvc. Filter return is about even with eyeball, there are 3 90's, a salt cell (funky compu-pool cell), a 1 1/2 x 3/4 tee to feed a rain effect that is currently capped and a 1 1/2 x 1 1/4 tee for fresh water input and a 1" eye

    Any help you guys could provide would be greatly appreciated.
    17K gal, AG, 1.0HP pump, 300lb, 3.14 sqft, 62GPM sand filter, Pool Pilot Nano SWG, TF-100 Test Kit

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    chiefwej's Avatar
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    Jun 2011
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    Re: Dialing in pump/filter run time

    http://www.mypoolyard.com/advanced_s...r&x=-497&y=-88

    Flow gauges are not that expensive. I added one to my system for $39. Just be sure to pick one that matches the pipe I.D.

    Im not great at math so it saved me a lot of time and guess work.
    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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    delirium330's Avatar
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    Re: Dialing in pump/filter run time

    Your goal shouldn't be to "turn the water over" once a day and you're going to go crazy trying to dial in the mathematical calculations to do so. Your goal should be to have crystal clear water which doesn't necessarily mean you need to turn the entire pool over. Often the best course of action is to run the pump for 4-6 hours a day to start, preferably 2-3 intervals that are convenient for you, e.g., adding chemicals, primary swim time. Then monitor and increase pump run time if needed. For me I like to run for 2 hours from 6am-8am (I add chemicals during this window) then again from 1pm-3pm (prime swim time is early/mid afternoon so the pool gets a fresh clean and skim before swimming) then finally again from 7pm-9pm for good measure.
    Built 2003, 14k Gallons, IG Pebbletec, Primary Pump: Sta-Rite Intellipro VS, Sta-Rite Series 3 S8M150 Cartridge Filter, Fiberstars Jazz Light w/Color Wheel, Polaris 280 Vacuum (Runs Zodiac PB4-60 Booster Pump) and 2 Waterfalls (Run on separate, dedicated 1HP Sta-Rite Max-E-Glas II Pump).

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    mas985's Avatar
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    Re: Dialing in pump/filter run time

    Turnovers and flow rates are irrelevant. Please read the pool school article here: http://www.troublefreepool.com/conte...-pump-run-time

    And if you want more in depth information, please read the run time article in my signature.

    Start at 4 hours and see how that goes.
    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: Dialing in pump/filter run time

    Thanks for the reply's. I'll give 4 hours a shot and go from there. Out of curiosity, would there be any chance that the total head in this system would be less than 50 feet? The only reason I ask is if it were less than 50 then there would be a chance that the pump could over run the filter (if I'm reading these pump curves correctly).
    17K gal, AG, 1.0HP pump, 300lb, 3.14 sqft, 62GPM sand filter, Pool Pilot Nano SWG, TF-100 Test Kit

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    mas985's Avatar
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    Re: Dialing in pump/filter run time

    Based upon your description above, I get about 61 GPM @ 50' of head. So yes the flow rate is close to the design flow rate but I wouldn't be too concerned. Sand filters are much more robust than other types of filters and can usually handle the higher flow rates. The design flow rate for the filter is 60 GPM (20 GPM/sqft) but usually for sand filters, the max rate would be around 80 GPM (25 GPM/sqft) so you are well below that. Have you had any issues with the filter?
    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: Dialing in pump/filter run time

    No problems, just wanted to get ahead of any potential issues.
    17K gal, AG, 1.0HP pump, 300lb, 3.14 sqft, 62GPM sand filter, Pool Pilot Nano SWG, TF-100 Test Kit

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