Calcium dosing

[Reeferdude1888]

Hi guys need a bit of help from you chemistry wizards I have my calcium back up to 460 ,I tested after 3 days to see how much the tank was using and the result was 20 parts drop per day now I wish to dose a stock solution of 5ltr ro .water with seachems reef advantage calcium to cover my 500ltr system but now for the big question how much of the reef advantage calcium would I have to add to the 5ltr ro to keep my calcium balanced at 460 if the tank is using 20 parts per day. Now I'm starting to confuse myself lol so I hope some one out there understands what I'm trying to do and can help me out thanks

 

[nereefpat]

I'm using this calculator: http://reef.diesyst.com/chemcalc/chemcalc.html

It looks like, for a 500 liter system that uses 20 ppm Ca per day, you would need to dose about 5 tsps or 25 grams of the dry Reef Advantage per day. So you could make a stock solution of several days worth, dissolved in the 5 liters of water, and go from there.

20 ppm Ca use would correlate to somewhere around 3 dKH alk per day. Does that sound right?

 

[45ZoaGarden]

5L is approximately 1% of the overall system volume. Since the system consumes 20ppm a day, the 5l should take 2,000ppm. Figure out how many ppm each tbsp of your calcium buffer raises 5l of water. Then calculate that up to 2,000 ppm

 

[Reeferdude1888]

I think 175grams of seachems into the 5ltr container dosed over seven days at the rate of 700ml a day split into 4 doses over the course of each day should keep things good .

And thanks for the help guys