I'd be careful with them. They are not a balanced two part, but just calcium and alkalinity supplements.
So, for example, they are not close to properly balanced for 1:1 dosing. The alkalinity portion is about 35% as potent as it should be for that purpose (based on their web site info).
For comparison to my recipe #1,
1. The ME coral calcium solution is equally concentrated to my calcium solution.
2. The ME coral alkalinity solution is 35% of the potency my alkalinity solution, so you need 2.8 times as much of the ME coral product.
This seems so odd that I want to show where it comes from, which is their web site:
https://mecoral.com/product/me-alkalinity-gallon/
"Quick guide: In order to raise Kh 10 dkh or from 8.00 to 8.10 in 100 gallons of aquarium water, add 20 ml or .7 fl oz. Drip slowly and test as needed."
Which has a typo anyway, but presumably the 10 dKH really means 0.1 dKH.
