Bulk Reef Supply RO/DI unit

thats one of the best ones you can buy. i have the 75GPD myself and plan on upgrading it by getting the 2nd membrane and dual DI canister just to prolong Filter changes on my DI resin.
 
+1, that's a very good unit. If your water has chloramines you need to upgrade to the chloramine filter unit. As posted above adding a second DI canister will pay for itself over time as it allows you to maximize the life of your resin. With a single DI canister you need to replace the resin as soon as it is allowing dissolved solids past the canister even though the resin is still removing some solids, with two canisters when you start to seen solids, you move the #2 canister into the #1 position, refill the old #1 canister with new resin and put it into the #2 slot.
 
Hi Grun,

Sorry I just read that myself and I didn't even know what I was trying to say lol. I was asking how do you know which canister is which and how do you know when to replace them?
 
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