RO/DI question

[mark]

Have the Aqua-safe also.

With a TDS of 20 after the RO would say it's okay but your DI is probably exhausted.

If your still running the post carbon after the DI, it could be the cause of the TDS not zero. Do you have the bladder, because if that wasn't drained, might be a cause also.

Diagram here

[hillegom]

For an aquarium, your DI should be your last filter, For your drinking water, preferences vary, but I have a charcoal as the last filter for the fridge and at the sink tap

[Myka]

I have no idea what the coconut carbon filter is...???

I may have missed it, but how many GPD is your system rated for? Most RO membranes (Filmtek 50 & 75 gpd and BFS 150 gpd) are 98% efficient which means if the water going in is 100 ppm TDS the water coming out will be 2 ppm TDS when it is new, and that will slowly rise until you need to change it. The Filmtek 100 gpd membranes are only 90% efficient, so if you have the Filmtek 100 gpd this is probably not a good choice for your higher TDS source water. You should be able to replace your flow restrictor with a regular type...they are cheap. Then choose a compatible RO membrane. I would suggest either the 75 gpd or the 150 gpd if you really want, just make sure it is 98% efficient. I think you may have exhausted your DI resins, but you can replace your RO membrane, and figure that out later. Don't forget to replace the sediment and carbon filters before the RO, and flush them before hooking into the RO like described earlier. I would ditch the coconut filter...don't know what's up with that, sounds weird.

[hillegom]

I agree with Myka about efficiency
Here is what one ebay seller said about coconut carbon

Carbon Cartridges are extruded carbon block with coconut carbon. Coconut carbon is a premium carbon that gives water a great taste, and some contend a "sweeter taste."

I would think something burned to carbon is the same for all materials. What do you have left? Just carbon IMHO

[midgetwaiter]

Originally Posted by Myka

I may have missed it, but how many GPD is your system rated for? Most RO membranes (Filmtek 50 & 75 gpd and BFS 150 gpd) are 98% efficient which means if the water going in is 100 ppm TDS the water coming out will be 2 ppm TDS when it is new, and that will slowly rise until you need to change it. The Filmtek 100 gpd membranes are only 90% efficient, so if you have the Filmtek 100 gpd this is probably not a good choice for your higher TDS source water.

This is why I don't like the Aquasafe for Alberta water, you burn through DI resin way too fast because the 100gpd membrane isn't as effective.

If the DI you had was brown from the start it might have been packaged badly. DI resin that isn't sealed will pick up CO2 from the air and exhaust it. Sounds like your flow restricor is messed too though, it should shut off the product water when you open it up.

[Treebeard]

The membrane is made my Applied Membranes. It is the M-T1812A100 model rated for 100gpd.

If the water is coming out of the membrane at 20 ppm, can I expect good DI resin to reduce it the rest of way to zero?

Where can I pick up a vertical DI canister?

[hillegom]

This is where I picked mine up, but there are a lot of sellers on ebay that might have them as well.
http://filterdirect.com/index.php?cP...fdb78bb04f5669