I am in the same boat, trying to patch together a combo of tubes and fittings and whatnot to get my TLF kalk reactor and dosing pump working.
I have a Jebao dosing pump—not enough pressure in it to really stir the kalk, but I really like the precision of it.
For the moment, I am going to use the TLF as a reservoir, and run the dosing pump intake line into the output of the reactor and down into it, and have the jebao pull from there. I have a stronger pump that I’m hooking up to the input on the TLF, and will refill the reactor every day with that pump. That will give it a good stir as well.
Kind of an off-label setup, but the normal TLF configuration would require fancier gear than I am inclined to get to automate a stronger pump and avoid accidental overdoses. My volume is only about 55 gallons—doesn’t take much kalk to over do it.