dosing pump

[rbarb1111]

I want to automate adding my twp part. I add about 50 ml of each every day to my 30 gallon tank and this is increasing. Can anyone recommend a good inexpensive dosing pump or a better way to dose.

thanks

 

[Brenden]

Why not just use gravity and a adjustable valve? That is as cheap as it gets.

 

[rbarb1111]

Can i dose both parts at the same time? i thought of an iv drip but i can not control the alk and ca at different times