geo 618 calcium reactor

antole · 07/09/2012, 09:13 PM

So I just purchased a used geo 618 calcium reactor on ebay. I use my apex to control it. Im just wondering how to lower the alk and calcium output. Should I change my PH on and off points should I increase the drip rate or slow it down. On the instructions it says the slower the higher the alk. Any help would be much appriciated.

sirreal63 · 07/10/2012, 01:39 PM

If the drip is steady and not slowing down or clogging, the easiest way is to raise the PH in the reactor, this is the same as slowing down the output.

led stony · 10/06/2012, 05:50 PM

Looking for geo 618 if you want to sell?

aandfsoccr04 · 09/24/2013, 07:40 PM

I'm new to the calcium reactor thing. I just picked up this calcium reactor and have an apex and plan to use them together. What exactly is the purpose of using the two together?

James77 · 09/24/2013, 08:03 PM

The apex would be used to control the CO2 solenoid. You could control the pH in the reactor this way or prevent it from going too out of whack...same could be done if you were monitoring pH in the tank.

aandfsoccr04 · 09/24/2013, 09:28 PM

So how exactly would I go about this? I have one ph probe in my tank. I guess I would buy a second one and then hook it up to my apex and my calcium reactor? What's the purpose exactly?

yachtdr22 · 09/24/2013, 09:48 PM

you set your second pH probe to shut off at a critical LOW point to prevent run-away..
My Geo 618 on my 125 apex solenoid program is this..

Fallback OFF
If pH2-Ca > 06.70 Then ON
If pH2-Ca < 06.50 Then OFF
If pH > 08.25 Then ON
If pH < 07.75 Then OFF

I had my drip rate @ 75ml per min and 55 BPM

I will warn you that things can go BAD quickly if your not ontop of it!
I just discontinued my reactor on my 125 and have gone to 2 part because my load is not enough to support it. I will set it up on the 375 once its kickin...

Mr. Brooks · 09/25/2013, 02:24 AM

This thread was started back in July of 2012, however I thought I'd answer in case anyone else was curious.

In my opinion it would be best to raise the PH inside the reactor. If you slow the drip rate down too much you risk getting it clogged.

aandfsoccr04 · 09/25/2013, 05:04 PM

Thanks for the responses. Sounds like it's a bit more of an art than a science to this.

sirreal63 · 09/25/2013, 05:39 PM

It's actually all science. You may find the calcium reactor articles here helpful.
http://reef.diesyst.com/index.html

07/09/2012, 09:13 PM	#1
antole Registered Member Join Date: Jun 2011 Posts: 50	geo 618 calcium reactor So I just purchased a used geo 618 calcium reactor on ebay. I use my apex to control it. Im just wondering how to lower the alk and calcium output. Should I change my PH on and off points should I increase the drip rate or slow it down. On the instructions it says the slower the higher the alk. Any help would be much appriciated.

07/10/2012, 01:39 PM	#2
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	If the drip is steady and not slowing down or clogging, the easiest way is to raise the PH in the reactor, this is the same as slowing down the output. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

10/06/2012, 05:50 PM	#3
led stony Registered Member Join Date: Feb 2012 Posts: 60	Still have reactor? Looking for geo 618 if you want to sell?

09/24/2013, 07:40 PM	#4
aandfsoccr04 Registered Member Join Date: Apr 2011 Location: Virginia Beach, VA Posts: 3,561	I'm new to the calcium reactor thing. I just picked up this calcium reactor and have an apex and plan to use them together. What exactly is the purpose of using the two together? __________________ 120 gallon mixed reef

09/24/2013, 08:03 PM	#5
James77 Registered Member Join Date: Aug 2005 Location: Rhode Island Posts: 8,158	The apex would be used to control the CO2 solenoid. You could control the pH in the reactor this way or prevent it from going too out of whack...same could be done if you were monitoring pH in the tank. __________________ Jim Current Tank Info: 120g Mixed Reef and 75g Freshwater

09/24/2013, 09:28 PM	#6
aandfsoccr04 Registered Member Join Date: Apr 2011 Location: Virginia Beach, VA Posts: 3,561	So how exactly would I go about this? I have one ph probe in my tank. I guess I would buy a second one and then hook it up to my apex and my calcium reactor? What's the purpose exactly? __________________ 120 gallon mixed reef

09/24/2013, 09:48 PM	#7
yachtdr22 Registered Member Join Date: Mar 2002 Location: corpus christi, tx Posts: 488	you set your second pH probe to shut off at a critical LOW point to prevent run-away.. My Geo 618 on my 125 apex solenoid program is this.. Fallback OFF If pH2-Ca > 06.70 Then ON If pH2-Ca < 06.50 Then OFF If pH > 08.25 Then ON If pH < 07.75 Then OFF I had my drip rate @ 75ml per min and 55 BPM I will warn you that things can go BAD quickly if your not ontop of it! I just discontinued my reactor on my 125 and have gone to 2 part because my load is not enough to support it. I will set it up on the 375 once its kickin... __________________ 125 FOLR, 30 gal sump w/LR, SWC 16

09/25/2013, 02:24 AM	#8
Mr. Brooks MASVC Member Join Date: Apr 2007 Location: Simi Valley, CA Posts: 3,477	This thread was started back in July of 2012, however I thought I'd answer in case anyone else was curious. In my opinion it would be best to raise the PH inside the reactor. If you slow the drip rate down too much you risk getting it clogged.

09/25/2013, 05:04 PM	#9
aandfsoccr04 Registered Member Join Date: Apr 2011 Location: Virginia Beach, VA Posts: 3,561	Thanks for the responses. Sounds like it's a bit more of an art than a science to this. __________________ 120 gallon mixed reef

09/25/2013, 05:39 PM	#10
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	It's actually all science. You may find the calcium reactor articles here helpful. http://reef.diesyst.com/index.html __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.