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Old 09-18-2017, 10:15 AM   #1
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Pressure tank - Standard versus Reverse Osmosis


I am using a tote water tank to collect rainwater from a workshop roof. The tank is 4 ft above ground. I have a toilet and sink inside the shop that are about 2 ft above the floor. I wanted to use gravity only to feed the toilet but the pressure is not there.
I am attempting to use a sprinkler pump as a "pressure booster" and gravity feed the pump from the tank. The pump is at ground level. I think that with a 20-40 lb pressure switch and a check valve before the inlet side of the pump, I can charge the line to operate the toilet. I also have a float switch inside the tank to disable the pump when the water level gets too low.
I don't care if the pump comes on whenever I use the toilet or sink because it will be very infrequent use, however I am looking at small pressure tanks that I might use in this system. I noticed that reverse osmosis tanks seem to be less expensive than standard pressure tanks.
Here is my question:
Can I use a reverse osmosis tank instead of a standard tank to save a little money? What is the difference functionally relative to my application?
Also, I have a hose bib inside the shop at floor level to bleed the system in the winter. Can I attach the tank there to pressurize the system? It will always be open to the water line.
Thank you
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Old 09-18-2017, 12:14 PM   #2
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Re: Pressure tank - Standard versus Reverse Osmosis


You've bout got my head spinning.

Have you considered simplifying things for infrequent use by keeping a 2 gallon and a 1 gallon bucket of water in close proximity to the toilet? Flush with the 2 gallon and refill the S trap with the 1 gallon container.
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Old 09-18-2017, 12:23 PM   #3
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Re: Pressure tank - Standard versus Reverse Osmosis


Reverse osmosis is a filtration system. You just need a pressure tank. There are two types, bladder tank or air over water. Bladder tanks are smaller and probably what you want for this ap.
I would suggest you get a constant pressure pump that does not require a tank.

Here is one at HD

https://www.homedepot.ca/en/home/p.3...000481016.html


Pressure tank - Standard versus Reverse Osmosis-p_1000481016.jpg
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Old 09-18-2017, 03:16 PM   #4
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Re: Pressure tank - Standard versus Reverse Osmosis


You might get away with gravity if you use the old style float arm ballcock. Not sure, never tried it on pressure as low as yours but I know they need less then a regular fluidmaster.
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Old 09-18-2017, 05:55 PM   #5
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Re: Pressure tank - Standard versus Reverse Osmosis


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Originally Posted by SeniorSitizen View Post
You've bout got my head spinning.

Have you considered simplifying things for infrequent use by keeping a 2 gallon and a 1 gallon bucket of water in close proximity to the toilet? Flush with the 2 gallon and refill the S trap with the 1 gallon container.
Yes I have. That's why I am using a pump.
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Old 09-18-2017, 05:56 PM   #6
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Re: Pressure tank - Standard versus Reverse Osmosis


I already have the sprinkler pump. I am trying to use what I have. $400+ is not an option.
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Old 09-18-2017, 06:45 PM   #7
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Re: Pressure tank - Standard versus Reverse Osmosis


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I already have the sprinkler pump
Then a bladder tank is the best option.
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Old 09-18-2017, 07:15 PM   #8
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Re: Pressure tank - Standard versus Reverse Osmosis


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Then a bladder tank is the best option.
So reverse osmosis tank would not work?
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Old 09-18-2017, 07:16 PM   #9
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Re: Pressure tank - Standard versus Reverse Osmosis


Quote:
however I am looking at small pressure tanks that I might use in this system. I noticed that reverse osmosis tanks seem to be less expensive than standard pressure tanks.
Also, I have a hose bib inside the shop at floor level to bleed the system in the winter. Can I attach the tank there to pressurize the system? It will always be open to the water line.
Ayuh,.... Can ya find an ole 100lb propane tank kickin' around that's empty, 'n probably Free,..??

Make sure it's empty by opennin' the valve, 'n standin' it upside down, outa the way somewhere outside, for a few days,...
Any left over gas, 'n more importantly, the Stink will go away, as they're heavier than air,....

Then chain the tank to a tree or something, 'n unscrew the valve from the tank,....
You'll be left with a 3/4" pipe threaded hole,....

Build a stand so the tank will securely stand, Upside-down,....

"T" yer water line into the tank, 'n turn on the pump,...
The captive air in the tank will give ya the buffer yer lookin' for,....

'n it really don't matter where in the system ya put the pressure tank,...
Most are nearer the pump, or pump switch, but I don't believe it's Necessary,....

I've got 2 tanks in my system, 1 at the pump switch, 'n another here in the cellar,.....
I added the 2nd to even out my shower, but the system also services 2 apartments, a garage, 'n an office,...
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Old 09-18-2017, 07:21 PM   #10
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Re: Pressure tank - Standard versus Reverse Osmosis


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So reverse osmosis tank would not work?
I have no idea what a reverse osmosis tank is with respect to pressure systems. Reverse osmosis is a filtration method. Nothing to do with a pressure system.
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Old 09-18-2017, 08:10 PM   #11
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Re: Pressure tank - Standard versus Reverse Osmosis


OK I googled reverse osmosis tank. That is just a small bladder tank. I think it would be too small for your system. The pump will cycle on and off too quickly.
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