View Full Version : How much Ca and Alk does your tank use per day in ppm?

12/21/2015, 09:33 PM
As stated, wondering how much Ca and Alk is used up in your tanks per day in ppm. Please include tank size and type of reef.

12/21/2015, 09:48 PM
My soft coral tanks went through 2-3 dKH per day. They were of various sizes, 29g and 12g being the more common ones.

12/22/2015, 09:08 AM
I am consuming about 2dkh per day in mostly empty tank. Couple of medium LPS, 6 LPS frags, few medium softies, and couple of SPS frags. No coraline algae yet. I am seriously considering calcium reactor. Soda ash and calcium media becoming costly.

12/22/2015, 09:35 AM
My mixed reef system uses 20 liters of fully saturated limewater per day ,5.1 gallons or so, for 650 gallons of water volume to sustain alk at 8.5 dkh. That's about 50 grams of calcium oxide powder.
Daily 1% water changes also add some.

12/22/2015, 02:23 PM
My system (120G DT and 40G sump) uses about 1 G of 75% saturated limewater per day in the winter via the ATO. In the warmer months, I use about 0.5 to 0.75G of saturated limewater. This keeps my tank at ~9dkh and ~440 Ca

12/23/2015, 05:44 PM
I dose 400ml of kalk/day and I spike my new saltwater (swaps 5l/day) with 14tsp of seachem mg to keep everything nice and even. I cant remember what it came to tho for dkh/day tho, just rememeber what I need to keep it steady =D

12/24/2015, 09:31 AM

50ppm calc
140ppm alk

Still a fairly new SPS tank.. 9 months in

12/24/2015, 10:23 AM
120gal mixed reef

77ml Ca
260ml Alk

12/24/2015, 01:37 PM
50 gallon breeder with soft corals and about 40% corraline algae coverage. 30ml of alk and calc per day of the BRS solution.

wayne in norway
12/24/2015, 02:36 PM
A pertinent question would be how much of the additives is precipitated straight out on addition. If you work out how many dKh you're adding to these tanks, and then convert it to grams, kilos of CaCO3 added per year, some peoples tanks would be cubes of concrete rather quickly.

I am always a bit wary of people who reply in terms of ml of 2 part, 3 part solutions. What's the answer in dKh and ppm, correct units?