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Thread: Think I want a Stenner but which one?

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    Think I want a Stenner but which one?

    BBB has been working really well but, it is not always convenient to put chlorine in the pool by hand everyday. I am interested in automating the chlorine delivery but SWG is no use as I have lots of flagstone round the pool and deck. I looked at the Liquidator but, reading up on it, it doesn't like my variable speed pump and I don't like the sound of the white stuff. This brings me to a Stenner pump and 15 gallon drum. I don't want to run it with my pump, I understand the Stenner prefers to run at a high speed for a short time. My current July average daily demand for 8.25% chlorine is 70 to 80 oz per day with CYA of 50. It can get hotter in August so I would have to allow for that. I have an Easy Touch 4 which I think I can add the pump to and run it while the pool is running, but if not, I will get it a separate timer.
    I am not sure which Stenner pump would be suitable for my size of pool and spa. Any advice would be welcome.
    13,200 IG pebble sheen pool with raised spa and waterfalls, variable speed Pentair pump, oversize Pentair cartridge filter, Legend pool cleaner. TF -100 test kit.

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    mikespoolfl's Avatar
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    Re: Think I want a Stenner but which one?

    This is information about the 2 fixed rate models. They come in 2 injection pressure ratings one for up to 25 psi (the MP models) and one for up to 100psi (the MPHP models) for the fixed rate models. I prefer the fixed rate because there are less moving parts and I adjust the run time for dosage. It seems most on here like the 45 models (26 rpm) vs the 85 models (44 rpm). The different tube sizes will give you the different flow rates. I have the 45MPHP10. At 10 gallon a day flow rate, I have a 35 minute run time per day.
    Screen enclosed 17K gal 16x30 IG with Diamond Brite finish, elevated 4 jet spa with spill over, Twin dolphin fountain, Hayward Ecostar pump[ Pentair intelliflo VS, Filter Sta rite Posi-Flo PTM 100, Aqua Cal heat pump, Tiger Shark QC robotic cleaner.
    Stenner peristaltic pump model 45MPHP10, 15 gal storage tank. TF 100 with Speed Stir.

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    Re: Think I want a Stenner but which one?

    Quote Originally Posted by Cypress3 View Post
    I understand the Stenner prefers to run at a high speed for a short time.
    That tends to be true...although I think plenty of people use the variable ones and don't run them at full...but running them at full is supposedly better for them and doesn't have the clicking sound. IMHO, if you're going to run it at full anyway, just get a non-adjustable one and control it purely via runtime which is what I plan to do when I get around to it (and convince the wife).

    Quote Originally Posted by Cypress3 View Post
    My current July average daily demand for 8.25% chlorine is 70 to 80 oz per day with CYA of 50. It can get hotter in August so I would have to allow for that. I have an Easy Touch 4 which I think I can add the pump to and run it while the pool is running, but if not, I will get it a separate timer.
    I am not sure which Stenner pump would be suitable for my size of pool and spa. Any advice would be welcome.
    Generally I think the 10 GPD (gallons per day) models are most-commonly used around here. For non-adjustable, that's either the 45MPHP10 (up to 100psi) or 45MP2 (up to 25psi) depending on the pressure of your system. They smaller 3 GPD ones would require pretty substantial runtime, and the larger ones are probably too fast (you don't want almost pure bleach coming out of your returns =p).

    You need ~75 oz per day and so that's 75 / 128 == 0.5859375 gallons per day. Since the pump is 10 gallons per day, you need 0.5859375 / 10 == 0.05859375 == 5.859375% of its daily output, and so you should run it for that percentage of the day. So 24 hours * 60 minutes/hour * 0.05859375 == 84.375 minutes...which you could probably safely round down to 80 or up to 90 (since you'll still be testing FC levels regularly and can make subtle adjustments or manually run the pump for a bit).

    So you need ~84 minutes per day, you can either run it straight 84 minutes or break that up. One solution might be to run it for an 60 minutes in the evening (since it's better to add chlorine after swimmers/sun are gone) and let it work all night...and then run it 24 minutes in the morning to prop levels back up for the next day's activity. It doesn't really matter...whatever you think works best.

    As an aside, in your pool (13.2 K gallons) it's about 20oz of your 8.25% bleach to get 1ppm FC...the pump would inject those 20oz in 22.5 minutes...so if you wanted like a quick boost before/after a big party, you could manually run the pump for 45 minutes.

    Hope all that makes sense!

    - - - Updated - - -

    Quote Originally Posted by mikespoolfl View Post
    At 10 gallon a day flow rate, I have a 35 minute run time per day.
    31oz a day for only 1.25 FC per day...that's a well managed pool especially for sunny Florida. Totally agree with fixed vs adjustable and 26rpm vs 44rpm...the 45MPHP10 is also the one I'm planning to get.
    40x20 IG gunite (~36K gallon). 6' attached spa with spillover. AquaLink RS OneTouch + SpaLink + iAquaLink 2.0
    450 sqft Sta-Rite cartridge filter, Sta-Rite single speed pumps (main, spa jets, booster)
    Coverstar Auto Cover, Polaris 280 cleaner, Taylor K-2006

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    mikespoolfl's Avatar
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    Re: Think I want a Stenner but which one?

    Down here I'm getting 10% bleach for under $2 a gallon. The stenner pump for me is very cost effective and only regret is not doing it sooner.
    Screen enclosed 17K gal 16x30 IG with Diamond Brite finish, elevated 4 jet spa with spill over, Twin dolphin fountain, Hayward Ecostar pump[ Pentair intelliflo VS, Filter Sta rite Posi-Flo PTM 100, Aqua Cal heat pump, Tiger Shark QC robotic cleaner.
    Stenner peristaltic pump model 45MPHP10, 15 gal storage tank. TF 100 with Speed Stir.

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    Mod Squad Bama Rambler's Avatar
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    Re: Think I want a Stenner but which one?

    I have the adjustable 3gpd unit and while it has worked well, if I had it to do over again I'd either go with the fixed rate unit or the new Econ unit.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Think I want a Stenner but which one?

    Quote Originally Posted by Bama Rambler View Post
    I have the adjustable 3gpd unit and while it has worked well, if I had it to do over again I'd either go with the fixed rate unit or the new Econ unit.
    Great feed back from everyone. It sounds like consensus is the fixed rate unit and 10GPD size. I will be able to use my easy touch so that takes care of a timer so I wouldn't need the Econ unit.

    Thank you Vyrolan for working out my run time that is really useful to me.

    I am surprised Bama Rambler would recommend the fixed rate over the variable speed as I would have thought the variable speed would make adjusting the chlorine dosage easier. I would love to know why you would choose fixed rate over your variable speed.
    13,200 IG pebble sheen pool with raised spa and waterfalls, variable speed Pentair pump, oversize Pentair cartridge filter, Legend pool cleaner. TF -100 test kit.

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    Re: Think I want a Stenner but which one?

    I just ordered an Econ FP pump and I'm waiting for it to show up. I plan on triggering it via a current switch when the pump is running and adjusting the duty cycle using the built in electronics. Basically similar to a SWG in concept but using liquid chlorine injection instead.

    The Econ pumps use DC motors so there is no clutch mechanism to cause clicking or wear out. On the plus side it is less expensive for a single task like injecting chlorine. From what I gather the Classic Stenner pumps are much more flexible in different tube sizes and are targeted to industrial chemical injection, seems a bit overkill for a pool.

    I'll post back in a few days once I get everything up and running.
    22,000 gallon in-ground plaster pool (circa 1960?) -- Sand filter (not sure year or model, older with metal housing) -- Propane heater (hope to be natural gas soon)

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    Mod Squad Bama Rambler's Avatar
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    Re: Think I want a Stenner but which one?

    The main reason I'd go with a fixed rate model is that it simply has less parts and running it the same amount of time as the main pump isn't as big a deal as I originally imagined.

    I'm really leaning toward the Econ, but want to reserve my recommendation until I have more experience with it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    mikespoolfl's Avatar
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    Re: Think I want a Stenner but which one?

    The Econ says "Acceptable for indoor use only". My pump is located outside not totally exposed but may get a little wet.
    Screen enclosed 17K gal 16x30 IG with Diamond Brite finish, elevated 4 jet spa with spill over, Twin dolphin fountain, Hayward Ecostar pump[ Pentair intelliflo VS, Filter Sta rite Posi-Flo PTM 100, Aqua Cal heat pump, Tiger Shark QC robotic cleaner.
    Stenner peristaltic pump model 45MPHP10, 15 gal storage tank. TF 100 with Speed Stir.

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    Re: Think I want a Stenner but which one?

    Quote Originally Posted by Bama Rambler View Post
    The main reason I'd go with a fixed rate model is that it simply has less parts and running it the same amount of time as the main pump isn't as big a deal as I originally imagined.

    I'm really leaning toward the Econ, but want to reserve my recommendation until I have more experience with it.
    Thanks for all the help. My pump will sit outside ( Econ says it is for indoor use) and I will use my Easy Touch as my timer so I have ordered the fixed speed, high pressure 10 GPD Stenner. It is actually cheaper than the Econ. I managed to buy a 15 gallon tank locally for 20 dollars so now I am looking forward to getting everything installed and running.
    13,200 IG pebble sheen pool with raised spa and waterfalls, variable speed Pentair pump, oversize Pentair cartridge filter, Legend pool cleaner. TF -100 test kit.

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    Re: Think I want a Stenner but which one?

    Quote Originally Posted by Cypress3 View Post
    Thanks for all the help. My pump will sit outside ( Econ says it is for indoor use) and I will use my Easy Touch as my timer so I have ordered the fixed speed, high pressure 10 GPD Stenner. It is actually cheaper than the Econ. I managed to buy a 15 gallon tank locally for 20 dollars so now I am looking forward to getting everything installed and running.
    You're going to love it. But watch out, it can make you lazy. I checked my water every day prior to installing the stinner, and for about a year after installing it I did the same, but after a year or so of never needing to adjust my chemicals I got lazy and now only check it every week or so (TFP please forgive me).
    Dallas, TX. 27,000 gallon in-ground free-form gunite. Built in 2007. DEL60 filter with single speed 2hp Hayward pump. Polaris 360 cleaner with associated booster pump. Stenner chlorine pump and tank. Intermatic P1353ME timer.

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    Re: Think I want a Stenner but which one?

    literally just finished my install. Do to a snafu with the company I ordered the pump from I ended up with the 85MHP5 which is a 5 GPD max. The gearing 45vs85 and internal tube are what regulate the max per day rate.

    either way, seems like you cant go wrong with this setup.
    25,000 gallon Concrete/Plaster Pool
    Pentair WFDS-26 - Installed Spring 2012
    Pentair Quad DE 100 - Installed Spring 2012
    Pentair Kreepy Krauly 820 - In Service 05/26/2013
    K-2006 Test kit, Intermatic P1353me Digital Timer, Stenner 85MHP5

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    Surf Hawk's Avatar
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    Re: Think I want a Stenner but which one?

    I'm a Stenner newbie, when people talk about running the pump for 84 minutes for example, do these Stenner pumps have their own timer that is separate from the timer my pump would be on?
    22,000 gallon IG; plaster; 16x32 Rectangular, Depth 3.5-8Ft.
    Hayward Pro-Grid DE Filter - 48sqft w/ cellulose fiber & Hayward Energy Flo RS Pump - .75HP (1.85SF)
    Very old 312sqft solar system, TFT-100 Kit with Speedstir

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    Mod Squad Bama Rambler's Avatar
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    Re: Think I want a Stenner but which one?

    You need to add a separate timer for the injection pump unless you have a multiple circuit timer already. They need a timer, but don't come with one.
    If you want to run it on the main pump timer, you'll need a adjustable model that isn't a great deal larger than the required amount.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Think I want a Stenner but which one?

    Quote Originally Posted by 1502tuley View Post
    You're going to love it. But watch out, it can make you lazy. I checked my water every day prior to installing the stinner, and for about a year after installing it I did the same, but after a year or so of never needing to adjust my chemicals I got lazy and now only check it every week or so (TFP please forgive me).
    I am so looking forward to being lazy!
    13,200 IG pebble sheen pool with raised spa and waterfalls, variable speed Pentair pump, oversize Pentair cartridge filter, Legend pool cleaner. TF -100 test kit.

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