Attloyden
New Member
- Joined
- May 22, 2019
- Messages
- 16
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Is it worth it, can it be done?
I would really like to know if anyone has that type of system, if it can be run on normal 40-80 psi water pressure. I do not like the idea of having to repeatedly buy mixed bed resin filters to get the water quality where I want it when the resin has been used up after 20 gallons of water. Even after reading up on TDS creep and installing the valve to siphon off the high TDS water that first comes out of the RO filter.
I have hard water 450ppm TDS most of it is calcium but the rest of it is nitrate in excess of 80ppm. The first pass with the membrane alone knocks the TDS down to around 44pmm, most of it is nitrates since the test from API matches in color to about 40ppm. If I pass that through a resin bed then I get like, 5ppm nitrates at the end but like I said, it's too expensive for me to do that way.
I'm just worried that the pressure from the pure water line isn't going to be high enough to pass through a second membrane. even if i do buy a 150gpd membrane and run the pure water line to a 50gpd membrane.
If i must i will buy an additional water pump, though I have not decided between electrical or one of those that runs off the waste water, it sounds like the waste water permeate pump will do the trick since the water should not have as hard of a time passing through the second filter in theory.
I have not found any information online about double pass reverse osmosis other than what it is. As far as I know there is no documentation about someone setting one up, save for commercial applications that use it for desalination of seawater.
I only have a 10 gallon fresh water tank, heavily planted, Three shrimp, two sparkling gouramis, five neon tetras, three bandit cory catfish and two guppies.
I'm using the Aquatic Life RO Buddie system.
I would really like to know if anyone has that type of system, if it can be run on normal 40-80 psi water pressure. I do not like the idea of having to repeatedly buy mixed bed resin filters to get the water quality where I want it when the resin has been used up after 20 gallons of water. Even after reading up on TDS creep and installing the valve to siphon off the high TDS water that first comes out of the RO filter.
I have hard water 450ppm TDS most of it is calcium but the rest of it is nitrate in excess of 80ppm. The first pass with the membrane alone knocks the TDS down to around 44pmm, most of it is nitrates since the test from API matches in color to about 40ppm. If I pass that through a resin bed then I get like, 5ppm nitrates at the end but like I said, it's too expensive for me to do that way.
I'm just worried that the pressure from the pure water line isn't going to be high enough to pass through a second membrane. even if i do buy a 150gpd membrane and run the pure water line to a 50gpd membrane.
If i must i will buy an additional water pump, though I have not decided between electrical or one of those that runs off the waste water, it sounds like the waste water permeate pump will do the trick since the water should not have as hard of a time passing through the second filter in theory.
I have not found any information online about double pass reverse osmosis other than what it is. As far as I know there is no documentation about someone setting one up, save for commercial applications that use it for desalination of seawater.
I only have a 10 gallon fresh water tank, heavily planted, Three shrimp, two sparkling gouramis, five neon tetras, three bandit cory catfish and two guppies.
I'm using the Aquatic Life RO Buddie system.