RO/DI System question

[Mrfish2020]

So currently I live in an area where well water is my main source, which has a reading of 39TDS. I recently bought a used BRS 75GPD Value system, I am using a 100GPD membrane with 450 flow restricter. I bought brand-new filters and DI media.
As I understand, 77f is optimal temp for water source my first 30 gallons of water I made, my temp was 57f with 40 to 60psi depending on if someone used the water there are 6 of us in the house pretty much got 50 Gallons out of my resin chamber before it started reading 1TDS. I plan on buying a 1000L tote for storage. The wife hates water bins in the living room. Is everything right about how much useable water I'm getting for 1.1 lbs of resin?
On another note, should I add 1 extra carbon and 1 or 2 more resin canisters. For 7 Stage. (Sediment>carbon>carbon>Membrane>DI>DI>DI)

Thanks

oh! And BTW, we sold the 32.5 Gallon fluvel kids didn't take good care of it and upgraded to 75 Gallons with sump.

 

[Gtinnel]

50 gal of water through the di resin before it starts increasing tds is not right, ecspecially with your incoming tds being low. I know very little about well water but if my memory is correct most people who use well water have to allow the water to sit in a container to off gas CO2 before putting it through their di otherwise it will quickly deplete their di.
I'm sure someone who uses well water in their rodi will chime in shortly.

 

[Woodyman]

50 gal of water through the di resin before it starts increasing tds is not right, ecspecially with your incoming tds being low. I know very little about well water but if my memory is correct most people who use well water have to allow the water to sit in a container to off gas CO2 before putting it through their di otherwise it will quickly deplete their di.
I'm sure someone who uses well water in their rodi will chime in shortly.

Second this, I don't experience this myself, but @KStatefan has a degassing setup, there is also a thread. Let me locate the link and I'll post it as well.

 

[Woodyman]

Second this, I don't experience this myself, but @KStatefan has a degassing setup, there is also a thread. Let me locate the link and I'll post it as well.

Found it..

DIY CO2 Degassing Chamber for RO/DI

Well, I learned the hard way that the water coming out of my well has a high CO2 content. I burned through a pound of DI resin and only got 40 gallons out of it.... To keep this from happening again, I could either buy lots of RO/DI water or remove the CO2 from the RO water before I pass it...

www.reef2reef.com

Another option if the degassing chamber isn't going to work for you, would be to run a 3 bed DI system.

 

[KStatefan]

77 is not the optimal temperature it is just the temp the membrane specs are for. If you have colder water then that you will get higher rejection but less product flow and higher it will be the opposite.

I built a degassing chamber like that link just made it bigger since I had room.

 

[Gtinnel]

As I understand, 77f is optimal temp for water

I also forgot to mention you should never try to temper your water. If you accidentally run hot water through your membrane it can instantly kill your membrane. Always just use a cold water line.

You would probably benefit from a booster pump too, even your highest pressure is at the lower recommended level.

Your CO2 issue would be the first issue I would try to solve though. Depleting di that quickly will add significantly to the cost to run the filter.

ETA- sorry I didn't see @KStatefan post before posting mine. I really need to learn to update the thread before posting something.