RODI-Chloramine

[bcarl77]

Yes correct. I probably wouldn’t seem to think much of it but the overall health of the tank seems to perk up after the blocks are changed.

 

[Randy Holmes-Farley Verified Community Expert]

Yes correct. I probably wouldn’t seem to think much of it but the overall health of the tank seems to perk up after the blocks are changed.

Do you change any other filters then? Is the TDS zero?

Ammonia release may be a net positive for reef tanks, and maybe that is related to the carbon blocks releasing more ammonia from chloramine breakdown when new.

 

[bcarl77]

TDS out of the membranes is 5. TDS out of DI is 0. No other filter changes. RO Membranes are 8 months old

 

[ReeferCub]

Thanks this was really helpful, and along what my thoughts were as well. Just didn't know if my line of thought made sense. Do most people place a sediment filter prior to the Chloramine monster? Or could I run it after the 2 carbon blocks (not sure that set-up makes much sense)

Honestly, the thing will pay for itself if I skip 1 recession event.

Did you end up running the Chloramine monster in front of your existing ro-di setup? If yes, did you use another sediment filter in front of the Chloramine monster?

 

[bcarl77]

After Randy’s responses here and talking to BuckyHydro no one thought is was necessary. I am measuring 0 Chlorine on the output water, so whatever the carbon blocks are not getting is getting removed by the membranes or DI.

I will continue to change carbon blocks every 1,000g of water input and may slow the incoming water to increase contact time.

 

[Malcontent]

Did you end up running the Chloramine monster in front of your existing ro-di setup? If yes, did you use another sediment filter in front of the Chloramine monster?

I would put at least one sediment filter in front of the Chloramine monster.

 

[Malcontent]

After Randy’s responses here and talking to BuckyHydro no one thought is was necessary. I am measuring 0 Chlorine on the output water, so whatever the carbon blocks are not getting is getting removed by the membranes or DI.

I will continue to change carbon blocks every 1,000g of water input and may slow the incoming water to increase contact time.

My chloramine levels are < 1.5 mg/L and I have 5 carbon stages with a sample tee off of the 4th.

You might need to install more stages to increase contact time. A side benefit is that you get more use out of your carbon blocks before they're discarded.

At some point I'm going to switch to loose carbon as it's more cost effective.

I also wouldn't put too much faith in the Hanna as they're not really comparable to lab grade chlorine tests (and those have a limit of detection of 0.02 mg/L or 20 ppb).

 

[bcarl77]

Yeah, my main observation is every time I am overdue on the blocks the coral health seems to go south. I still may add one at some point. Given how high my chloramines are may just be worth the peace of mind.