RO/DI Questions

[buy_baff]

Ihe one that came with the unit. The system is a coralife pure flo and the membrane is
GE osmonic brand membrane tfm 50.

 

[maynardjames]

everything i have read said 75gpd membranes from dow removed more then any other size. you would have to swap out flow restrictor if you upgrade. i had the coralife 24 gpd when i started out, it was more like 5gpd i use it for dual di unit now

 

[Dustin1300]

After I let the unit run much longer yesterday seems like my numbers have stabilized.

Source water (407 ppm) -> Membrane/RO (6-7 ppm) -> Dual DI (0 ppm)

With this being said do you believe the degassing column would be beneficial? Know any simple ways of building one? From the numbers I'm getting seems like the 100 GPD unit is doing a great job of rejecting the unwanted water. Time will only tell but I want the unit to function as efficient as possible. The more money I save here the more I can invest in other areas in the tank.

 

[bertoni]

The degassing tower would help if there's a lot of carbon dioxide in the water. I don't have any plans for a degassing tower, but some of the vendors might be able to help.

 

[cherubfish pair]

What's the TDS of the tap water, and what kind of membrane does the unit have? Is it a 75 gpd membrane? They should reject about 96-98% of the tap water TDS.

Neither carbon nor sediment filters will reduce the TDS. You might need to add a degassing phase, or the RO membrane might be having some problems.

Is a degassing phase just for carbon dioxide? With our well we get bubbles from the pump's inlet too shallow. Would a degassing column work? Any links?

 

[bertoni]

The degassing will work for any gas that's above saturation with respect to the ambient air. Carbon dioxide tends to be the biggest problem because it ionizes and then depleted the DI resins. I don't have any links on degassing columns. They don't seem to be very common. I can try searching some tomorrow. You might ask some of the RO/DI vendors. At least some of them have some background in this, but I don't remember which ones at the moment.

 

[Dustin1300]

Is a degassing phase just for carbon dioxide? With our well we get bubbles from the pump's inlet too shallow. Would a degassing column work? Any links?

As bertoni earlier outlined, the best way to see if it is beneficial is to take a cup of tap water and measure PH. After taking note of that PH aerate it outside and see if the PH changes dramatically. My PH was the same so I'm not going to go that route but its worth the easy test to see if you can save on some DI/filters!

 

[cherubfish pair]

As bertoni earlier outlined, the best way to see if it is beneficial is to take a cup of tap water and measure PH. After taking note of that PH aerate it outside and see if the PH changes dramatically. My PH was the same so I'm not going to go that route but its worth the easy test to see if you can save on some DI/filters!

The problem isn't knowing if there's gas in the water because the bubbles are visible. This is coming from the well's pump, not an aquarium pump.