Zero TDS issues

[stinkydavis]

Hello,
New to the saltwater life. I have a 75 gallon tank and am trying desperately to get 0tds from my Aquatic Life Twist-In RO/DI Unit 4-stage. I have a booster pump to it since I run off a well. I can’t get under 4. The system is new and only has ram maybe 200 gallons of product all the way through. I have played with temp and psi. Any help would be great. The system was $130 so annoyed that this seems like a impossible feet. The TDS for the faucet is 350. Thank you

 

[Biglew11]

Is that 4 tds at the membrane or 4 tds after the di ressin? 4 after the membrane is good but it should be zero after the di.
Is the di ressin packed tightly so theres no channeling of water through it.

Is the di resin used up? Someone running on well water can explain better than me but there's a lot of post about well water containing co2 that needs to be off gassed before running through the di resin.

 

[stinkydavis]

Is that 4 tds at the membrane or 4 tds after the di ressin? 4 after the membrane is good but it should be zero after the di.
Is the di ressin packed tightly so theres no channeling of water through it.

Is the di resin used up? Someone running on well water can explain better than me but there's a lot of post about well water containing co2 that needs to be off gassed before running through the di resin.

It is after the DI. It’s the twist in so it’s prepackaged. It doesn’t look to have changed color at all

 

[stinkydavis]

Is that 4 tds at the membrane or 4 tds after the di ressin? 4 after the membrane is good but it should be zero after the di.
Is the di ressin packed tightly so theres no channeling of water through it.

Is the di resin used up? Someone running on well water can explain better than me but there's a lot of post about well water containing co2 that needs to be off gassed before running through the di resin.

 

[KStatefan]

Prior to making a degassing chamber I only was able to make 100 gallons before my full size DI was not producing 0 tds water. I would get a CO2 test kit to see what you have.

 

[Spare time]

Prior to making a degassing chamber I only was able to make 100 gallons before my full size DI was not producing 0 tds water. I would get a CO2 test kit to see what you have.

I had an issue with short DI life span until I made a bypass for flushing every time (for a minute) after the unit turned on