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Thread: Question on Stenner numbers

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    Reddogdan's Avatar
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    Question on Stenner numbers

    So I got to test the Stenner while out of town for four days. Pump is a 5gpd running three hours a day with a cya of 70. Got home from DC yesterday and ran my numbers and found an FC of 3. Any ideas.? I had been running the pump from 8am to 11 am. I thought maybe it was going in so slow that the sun was getting it to soon. I changed the times to run from 2am to 5am to see what will happen.
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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    Reddogdan's Avatar
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    Re: Question on Stenner numbers

    Well, I think I may have my answer. I need to wear my reading glasses when I set the timers so I can tell am from pm!
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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    Re: Question on Stenner numbers

    I hope that answers it!

    What was your starting FC, and what concentration of chlorine do you have in the tank? A 5gpd (640oz/day) pump running for 3 hours should dispense 80oz/day. If you're using 8.25% bleach, from http://www.troublefreepool.com/calc.html plugging in your 14.3 gallon pool that should increase FC by 3.7 ppm/day. Here's how I'd verify the setup:

    1) Set stenner to inject overnight (just to isolate adding from sun usage; not because it matters usually)

    2) Measure FC in the evening before injection

    3) Measure FC first thing in the morning after injection. Should be ~3.7ppm higher (depending on concentration)

    4) Measure FC the next evening before injection after a sunny day. This tells you the approximate consumption each day.

    The FC shouldn't get used up any faster if you inject during the day vs night, but there is preference here for adding chlorine in the evening after the sun goes down so that the higher concentration is present for longer overnight to kill things before the sun starts to deplete. The key is that the FC level right before injection must be above your minimum for your CYA level.
    21000gal IG plaster, Sacramento CA area (late 1950s/early 60s)
    Filter: Cartridge, Pentair CCP420 (2014)
    Main pump: Pentair IntelliFlo VS (2015)
    Boost pump: 3/4hp (2011), Polaris 280 cleaner (unknown age)

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    Reddogdan's Avatar
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    Re: Question on Stenner numbers

    I don't know what my starting FC number was because we were on vacation. I need to do this test today and see what's going on. I got home yesterday from a 3 day trip and the FC was at 1.5. That's with 3 hours and 15 minutes runtime with 8.25 and a CYA of 70. Something is not right.
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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    Reddogdan's Avatar
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    Re: Question on Stenner numbers

    Is the only difference between the 85mphp5 and 85mphp17 the tube size inside?
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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    Reddogdan's Avatar
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    Re: Question on Stenner numbers

    Anyone?
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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    TFP Guide

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    Re: Question on Stenner numbers

    Yes you can change the roller tube size and that will change the GPD take a look at page 2 of the spec sheet HERE
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

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    Reddogdan's Avatar
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    Re: Question on Stenner numbers

    Thanks! With the heat, I may have to switch tubes. The heat must be degraded my bleach and I'm ending up with a long run time.
    14.3k, 3 1/2-5 1/2, IG, Pebble Wet Edge Northshore Tahoe, Jandy 4 cartridge, Jandy 2hp variable, Pentair 320 inline chlorinator fed by a Stenner, Polaris 280, K-2006 test kit, Built 9/13
    Fill water: TA=90, PH=70, CH=90

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