Check my maths with Kalk

[martinhal]

Please check if I got this right.

Tropic Marin adds 28ppm Ca to 5 Gal per spoon . I add 3 spoons per day in a 50 gal thus I am adding 8,4ppm (28x3/10)

1 ml Brightwell Kalk power mix adds 2.3ppm to 1 gal and thus 0.046ppm per 50 gal (2.3/50).

I would thus need 182.6 ml of this to get my 8,4ppm ? ( 8.4/0.046

[David Grigor]

Just use the reef calculator in the chemistry archives.

Using the calculater, Tank volume 50 gallons, increase your ca ppm by 8.4ppm using Kalkwasser ( fully saturated which is 2 teaspoons per gallon ) = .51 Gallons.

Or simply, 1 teaspoon of Kalk mixed to your daily topoff amount.

[rayjay]

I've never bothered to calculate ppm of the limewater.
I mix 6 tablespoons of calcium hydroxide in six gallons (large old I.O. pail) and use it to top up all my tanks nightly, replacing all evaporated water with the full strength limewater.

[bertoni]

Saturated limewater is about 800 ppm calcium and 40 meq/L. That's about 10 ml of kalk per gallon of water.