Good evening, i have a RODI question. I have a air water ice extreme typhoon with a senna dual online tds meter. I back flush for 10 mins and let it run for 10 mins. Main issue per se.is I see 1 tds on the out after di. The resin is color changing so it's not exhausted, weird thing is I tested with a handheld tds and it shows 0. Anyone can think of why dual online is different from the handheld?
Also wanted to add the only time I saw the online showing 0 tds if I unhook the di cartridge and pour out the water and let the system fill back the canister, it will show 0 tds. When the system bleeds out the air trapped in the canister and it's not full of water it goes back to 1 tds. Is the di canister suppose to be half full of water or filled with water all the way to the top?
Also wanted to add the only time I saw the online showing 0 tds if I unhook the di cartridge and pour out the water and let the system fill back the canister, it will show 0 tds. When the system bleeds out the air trapped in the canister and it's not full of water it goes back to 1 tds. Is the di canister suppose to be half full of water or filled with water all the way to the top?