FAQs on Calcium Reactors:
The Top 10 (Plus) Frequently Asked
Questions about Calcium Reactors by Jason Chodakowski
Calcium Reactors and How They Work
by James Gasta
Calcium, Understanding Calcium &
Alkalinity, Kalkwasser, Calcium
Related FAQs: Knop, Korallin, & DIY Calcium
Reactors, Calcium Reactors
1, Calcium Reactors
2, Calcium Reactors
3, Calcium Reactors
Reactors 5, & FAQs on Calcium Reactors: Rationale/Use, Selection, Installation, Operation, Media, Measuring, Trouble-Shooting, & Calcium and Alkalinity, & FAQs
on: The Science of Calcium &
Alkalinity, Importance, Measure, Sources, Use of
Additives, Troubleshooting/Fixing, Products,
calcium reactor question; media
Hello I've got a 300 g mixed reef system (incl. sump), with growing
Sps and a Korallin 1502 reactor. Korallin claims it is good for up to
400g. I can't seem to dial this thing in properly.
My tank Alk meq/l keeps decreasing from 3.2 now to 3.0.
<What are you using for media? I suggest the Knop Korallith
product... DO make sure you are buying this... as there are people who
package other material and affix the title to it>
Also the only way for my effluent Alk to get over 15 kH is if I
increase bpm to make pH get down to 6.3.
<Too low... about the limit here should be 6.8, perhaps at lowest
Do I want a broken stream of effluent or maybe just 3 drops/sec.
<A stream should do it>
My bubble rate is 60/min. I have the Digital Aquatics controller
keeping the ph between 6.4 and 6.6 with ARM coarse media.
<I like CaribSea as a company (and WWM sponsor), but not this
product in most reactors. Again... switch>
Should I decrease the co2 bubble count so that the CO2 stays on longer
and never shuts off or will this eventually weaken the alkalinity of
the effluent? Or do I not need to worry about the amount of CO2 getting
into the reactor and only worry about keeping the ph at a certain level
Should I increase the bpm even more?
<No; I would not... the trouble here is the insolubility, make-up of
But then it will shut on and off every 10 or 15 minutes also weakening
alkalinity,.. I also dose Kalk at night with a PM kalkreactor. I've
been trying to adjust the reactor now for a month. What is a good
bubble rate and drip rate to go with in others' experience?
<Cheers, Bob Fenner>
Korallin denitrator 5/16/10
Hello, I purchased filter 5 weeks ago. It reduced my nitrates to zero
within weeks. Fourth week water became super cloudy in filter top and
then my tank became cloudy. I was using a real slow drip rate. 1 per
I increased it and still cloudy. I took out coral media because it was
suggested it was being melted and causing cloudiness. Tank cleared up
for two days. Then cloudy but not as bad. Meantime nitrates and
nitrates remained at zero. Ph though was behind dropped coming out of
filter 7.4 or lower. I purchased ph buffer but it was still falling
after two days.
Cloudy water and dropping ph are my problem. Filter works great on
nitrates but killing ph. I had inlet in sump for biodenitrator, which
worked. They recommended it to come from tank. Which I can do if
<I doubt this would make a noticeable difference.>
Marine depot thinks there is co2 bulling up in filter and melting coral
and dropping ph.
<Could be the case, but a slow effluent at 7.4 should not bring the
whole tank down as bad as it sounds. What size tank is this on? What is
the tank pH?>
I can't find any reviews stating having my problem which is even
more frustrating. I turned off today. I don't want to abandoned it.
I saved up for it forever!
<IF this is indeed causing your issue, there are solutions. One of
the simplest is to rid the water of excess CO2 before it returns to the
A little powerhead directed through the effluent stream towards the
water surface can work wonders here. Some will even have airstones
under the effluent line to accomplish this, but then you have bubbles
that can return to the tank to deal with.>
<Welcome, Scott V.>
Re: Korallin denitrator 5/16/2010
75 gallon tank. with a wet dry 125 filter. pm 100 protein skimmer.
<Some will even run the effluent back prior to the skimmer intake to
blow off the CO2. This does work, but does void the warranty with some
Nextreef nitrate reactor with nitrate sponge media...didn't help so
<Have you called Dave at Nextreef re this? This is a first class
company and people. I would give them a ring. The reactors have some
differences, but the base function is the same.>
tank ph is 7.8 to 8 from test kit.
<An okay range.>
bought Kent liquid ph buffer to help raise it.
<This will not work long-term if CO2 is the issue, being constantly
tank inhabitants are a small snowflake eel. pixie fire hawk and a
tank going for 2 years. sorry for bad punctuation. typing from cell
thanks for your advice
<Welcome, Scott V.>
Calcium Reactor Instructions, Korallin
12/25/07 I recently purchased a Korallin Calcium Reactor 1502 from
a private seller on EBay. Unfortunately, no instructions were included.
Can someone email me a copy or make me aware where I can find these?
Michael A. Grande <Email, write or call Marine Depot (.com)... in
Orange County, CA... the U.S. Distributor of their line. Bob