Stream Method CalRx help needed

[Crustaceon]

Just to prove even experienced reefers sometimes get stumped, here’s what I have going on with my calcium reactor and why it has me scratching my head.

Aquamaxx c-tech T nano on a 65g system
90ml per minute effluent flow (it’s been stable for a few days straight, so no problem there)
6.75 reactor ph (very stable, I’m happy with this tunze reg)
ARM course media (Not sure about this stuff)
2 Co2 bubbles per second @ .5 bar per my Tunze reg’s recommendation
And the stumper... 7dkh effluent and this is after 24 hours at that ph level. My goal is 8dkh in the display.

My tank’s dkh is currently at 7.

Someone here probably has a really simple explanation and fix. I’m guessing it will be to keep lowering the ph until I see an alk increase in the effluent... Or not. Any thoughts?

 

[Shirak]

There was someone recently in Australia running ARM media and he couldn't get the stuff to dissolve even at 6.5 pH. His reactor looked like a tornado of CO2 and still nothing.

 

[TX_Punisher]

Try running reactor ph closer to 6.3. I’m running mine at 6.32 per my probe. I’m using ARM coarse.

your other option is to slow down the effluent and test until you produce the dkh in the effluent needed to maintain tank alkalinity.

 

[Crustaceon]

There was someone recently in Australia running ARM media and he couldn't get the stuff to dissolve even at 6.5 pH. His reactor looked like a tornado of CO2 and still nothing.

That’s kind of what i’m wondering. I think I’m going to run a test for a day or two using the drip method and keep driving down the ph until I see a change. I’ve heard of ARM melting as low as 6.2, which seems really odd.

 

[Crustaceon]

Try running reactor ph closer to 6.3. I’m running mine at 6.32 per my probe. I’m using ARM coarse.

your other option is to slow down the effluent and test until you produce the dkh in the effluent needed to maintain tank alkalinity.

I’m glad it’s not just me. ARM definitely IS NOT reborn, lol. Sheesh. I’ll give it a shot. I’m feeling a lot better about this already. Thanks.

 

[Crustaceon]

Running 6.35ph and it’s doing the trick! I’m through one syringe of red sea alk test @ 50/50 sample/rodi so far and she’s still blue in the test tube.

 

[dadnjesse]

Don't worry about what your PH probe reads, Tune the reactor to the effluent Alk. Should be at least 20 Dkh