Which Stenner pump....10 or 22gpd?

[anthony21078]

Biting the bullet and purchasing a 15 gallon stenner pump/tank. Last decision to make is GPD sizing which will be either 10 or 22.

My pool is 22000 gallons with a CYA of 40 and I always try to keep my FC on the higher side near 7. I always use 10% bleach with almost a daily ritual of dumping between 80-110 ounces per day. Adding the bleach typically occurs late at night with the pump running and pouring half of the 80-110 oz’s in front of each of the two returns. I certainly don’t do a slow pour but somewhat quickly. I rarely have issues with my water and the chemistry is always correct.

With that said, I figure the larger 22 gpd pump would more closely simulate the way I add bleach and run for a shorter amount of time vs the 10 gpd pump. I’m having a hard time figuring out the math on how long to run the timer so any help is appreciated. Is there any benefit to getting the smaller pump and having it run for longer period of time?

 

[ajw22]

You will find some Stenner pump calculators that may help you at...

Calculators - Further Reading

www.troublefreepool.com

 

[rphpool]

#4 or 5 tube will probably be a good choice so pump will have a shorter daily run time.

 

[anthony21078]

Wow that excel sheet was perfect. Now I'm looking at either a 22 or 50 gpd pump with a 30 gallon tank. Either way, its difficult to find one that is actually in stock on some of these websites.

The 45MFL5 needs 35 to 50 minutes to meet my FC demand.

I found this one with the 45MFL5 but its 3/8" tubing instead of 1/4".......The site says 10gpd but it has to be typo. The part # reflects the 50gpd pump

Stenner Single Head Fixed Output Pump with 30 Gallon Tank #5 Tube 50 GPD System

The Stenner S3G45MFL5A4S Single Head Fixed Output Pump with 30 gallon tank features the Stenner Classic 45MP5 Series peristaltic pump. These pumps remain as the most popular pump with installers. The tank features a childproof lid and rain-roof. The tank is constructed from Polyethylene and is...

www.freshwatersystems.com

Rookie question here, is buying the tank and pump separately exactly the same as buying the combo per-assembled system? I'm assuming the pump comes with all the parts I need to attach to the tank right?

 

[Flying Tivo]

The tank is overpriced, you can find on amazon similar tanks.

 

[hexabc]

Biting the bullet and purchasing a 15 gallon stenner pump/tank. Last decision to make is GPD sizing which will be either 10 or 22.

My pool is 22000 gallons with a CYA of 40 and I always try to keep my FC on the higher side near 7. I always use 10% bleach with almost a daily ritual of dumping between 80-110 ounces per day. Adding the bleach typically occurs late at night with the pump running and pouring half of the 80-110 oz’s in front of each of the two returns. I certainly don’t do a slow pour but somewhat quickly. I rarely have issues with my water and the chemistry is always correct.

With that said, I figure the larger 22 gpd pump would more closely simulate the way I add bleach and run for a shorter amount of time vs the 10 gpd pump. I’m having a hard time figuring out the math on how long to run the timer so any help is appreciated. Is there any benefit to getting the smaller pump and having it run for longer period of time?

My pool is of a similar size as yours. I'm running a fixed head Stenner pump 45MPHP10 (the version for 100psi output pressure) at 10GPD rate. This rate is achieved with tube #2. Switching to 22GPD is as simple as replacing tube #2 with #7, but my setup works great with #2. Here are calculations applicable to tube #2; for tube #7 (22GPD), replace 1280 with 2816:

A simple proportion:
1280 oz (10 gal) - 1440 minutes (24 hours)
desired_chlorine_volume_to add [oz] - pump_run_time/day [minutes]

Hence:
pump_run_time/day [minutes] = desired_chlorine_volume_to add * 1440 / 1280

For example, if your pool needs 80 oz per day:
pump_run_time/day [minutes] = 80 * 1440 / 1280 = 90 minutes.

It is generally a good idea to add chlorine in smaller doses, several times per day. I have an Intermatic P1353 timer, which turns the Stenner pump on at 6am, 11am and 3pm. Make sure that your timer is wired in such a way as to make it impossible tu turn the Stenner when the filter pump is not running.

 

[rphpool]

This is what I have. If you have a Coke or Pepsi bottling plant near you they throw these out all the time.

15 Gallon Closed-Head UN Rated Poly Drum with Screw Cap - Blue Drum

ITEM #: 1H1-15-AB FDA compliant / food grade

www.airseacontainers.com

 

[anthony21078]

My pool is of a similar size as yours. I'm running a fixed head Stenner pump 45MPHP10 (the version for 100psi output pressure) at 10GPD rate. This rate is achieved with tube #2. Switching to 22GPD is as simple as replacing tube #2 with #7, but my setup works great with #2. Here are calculations applicable to tube #2; for tube #7 (22GPD), replace 1280 with 2816:

A simple proportion:
1280 oz (10 gal) - 1440 minutes (24 hours)
desired_chlorine_volume_to add [oz] - pump_run_time/day [minutes]

Hence:
pump_run_time/day [minutes] = desired_chlorine_volume_to add * 1440 / 1280

For example, if your pool needs 80 oz per day:
pump_run_time/day [minutes] = 80 * 1440 / 1280 = 90 minutes.

It is generally a good idea to add chlorine in smaller doses, several times per day. I have an Intermatic P1353 timer, which turns the Stenner pump on at 6am, 11am and 3pm. Make sure that your timer is wired in such a way as to make it impossible tu turn the Stenner when the filter pump is not running.

I understand that pump output is dictated by tube sizing and I found a good price for 50gpd pump for around 160$ new. All other sizes are well over 200$.

This is what I have. If you have a Coke or Pepsi bottling plant near you they throw these out all the time.

15 Gallon Closed-Head UN Rated Poly Drum with Screw Cap - Blue Drum

ITEM #: 1H1-15-AB FDA compliant / food grade

www.airseacontainers.com

30$ + 50$ for shipping is not bad at all. Best price on a stenner 30 gallon tank with shipping I could find is 240$

 

[GP2]

Another stenner calculator that may be helpful here (or links in signature):

Stenner Tracking v0 - Blank Copy.xlsx

1drv.ms

The 45MFL5 needs 35 to 50 minutes to meet my FC demand.

Screen shot of output with the 45MFL5 (with spec #5 tube, 50gpd). . . looks to meet 80oz in 18 min, and 35-50min would dose in the 5-7ppm FC range based on 26kgal-10%-50gpd

 

[anthony21078]

I was messing around with the excel last night and changed the bleach to 6%. Left that 6% there today when changing the pump to 50gpd so that's why my numbers were off today. Regardless, a 50gpd pump at 160$ new seems to be the best price I can find. If adding the bleach at this rate seems to be problematic I can always change the hose size.

I have always used 10% bleach but it kept inside in the AC away from light with dates never older then 2 months. Adding 25 gallons or so to a outdoor tank will obviously accelerate breakdown. It wont be in direct sunlight though. Maybe 6% is the way to go now

 

[GP2]

Got it, that runtime makes sense @6%. Yes I think you have plenty of workable options with different bleach concentration or changing tubes once you get up and running and see what setup works best for you. I don’t see any issues even with 50gpm and 10%. I use 12.5% and refill every 3-4 weeks.

 

[anthony21078]

Got it, that runtime makes sense @6%. Yes I think you have plenty of workable options with different bleach concentration or changing tubes once you get up and running and see what setup works best for you. I don’t see any issues even with 50gpm and 10%. I use 12.5% and refill every 3-4 weeks.

12.5% for almost a month huh? Hmmmm, when you test FC as it nears 3 to 4 weeks since the last tank fill-up, are you noticing FC levels are the same as week 1? Do you need to run the pump and any longer towards the end of the refill cycle to account for degraded bleach?

 

[GP2]

12.5% for almost a month huh? Hmmmm, when you test FC as it nears 3 to 4 weeks since the last tank fill-up, are you noticing FC levels are the same as week 1?

I’ve only been running the stenner for 6weeks or so and the fist month short-filled the tank twice so was more like 2 weeks storage with no issues. Stretching for 3-4 now... I’m going into third week and still seeing no change in FC vs runtime. Will be keeping an eye on it over the next 10 days or so to see if any impacts. It will likely be 21-26 days max and I’ll need a refill.

 

[Chasarms]

No matter what pump you choose, don’t simply expect it to pump at exactly the published rate. Set up your system and have it pump into a measured container so you can calculate the actual pump rate. My Stenner was published to pump .75 ounces per minute, but testing revealed that it pumps about .95 ounces per minute. That’s a big swing. It doesn’t impact its usefulness, but it changes the run times significantly.

 

[anthony21078]

No matter what pump you choose, don’t simply expect it to pump at exactly the published rate. Set up your system and have it pump into a measured container so you can calculate the actual pump rate. My Stenner was published to pump .75 ounces per minute, but testing revealed that it pumps about .95 ounces per minute. That’s a big swing. It doesn’t impact its usefulness, but it changes the run times significantly.

Good advice

On another note, what causes bleech to breakdown quicker......sunlight or heat?

I have a shed that is approximately 10 feet away from my equipment pad. I have the option of placing the tank inside the shed which is always dark but also 10-15 degrees warmer then the outside air temperature.

 

[Chasarms]

I am on week three of dosing with the Stenner. Between testing and dosing, there’s chlorine in my tank that is nearly a month old. It has sat in mostly shade n temps as high as mid 90s. So far, I have not noticed dropping chlorine levels. I have been tweaking the run times trying to find the sweet spot, and tests seem to reflect the ppm I am expecting.

My tank is a 13 gallon heavy duty plastic barrel. I bought it in FB marketplace for $8.

 

[BowserB]

Related question. I keep reading that higher concentrated chlorine degrades faster than lower. For now, I'll accept that as fact. Now, since 12.5% chlorine is 87.5% water, if your bought 12.5% and diluted it 50% with water when you fill the tank, would it's storage life be comparable to filling the tank with 6% chlorine? I'm thinking of less chlorine solution to transport, plus in my shopping I find higher concentrate chlorine to be effectively cheaper often than lower concentrate. Should the dilution be with distilled water?

 

[Flying Tivo]

That is what is suggested for acid to dilute 50:50, it will also work for Chlorine. It will need longer runtimes but will be more precise.

 

[DanF]

That is what is suggested for acid to dilute 50:50, it will also work for Chlorine. It will need longer runtimes but will be more precise.

Why the increased precision? Is it because you can rely on the lower strength percentage being more accurate over time?

Related question. I keep reading that higher concentrated chlorine degrades faster than lower...Should the dilution be with distilled water?

I've read the same, but I can't find it right now. As far as distilled water I have also read (and can't find right now) that distilled water is preferable for Cl dilution because tap water may contain metal;s which will react with the chlorine. If true, means more jugs to lug.

 

[Flying Tivo]

Timers usually dont have seconds only minutes of additions, the lower the strength more minutes to run. You are looking way to much into it. This systems works, little more or less of additions wont make your levels go critical. Regular tap water is ok unless its well water with known metals.