If your gonna dose in a small system and want to drip Kalk without the cost, you can do it this way. I have a 16g system, I dose 28oz every three days. I mix 1/4 tsp of Kalk into 32 oz of DI water.. most use RO or Ro/DI. Let it sit at least 2 hours. Take an airline tube and an air valve. Insert it into the bottle stopping about and inch or two from the bottom. This way precipate won't go into the tube. With the tube in the container, cup the opening and blow into the opening creating a siphon. Ajust the air valve, so that a drop a sec comes out. This does will take up to 4-6 hours to disperse into the tank. You don't want to top off all at one time, or your PH will skyrocket and crash your tank. I dose a few hours after lights out, because the PH naturally drops at night.