Currently dosing manaul. No kalk stirrer, no calcium reactor. Time for dosing pumps? I think at least four channels. Seems like the AM is a popular choice.
I have an AM quad doser with built in computer to control the pumps seperatly if you interested... in excellent condition
You cant go wrong with a doser. I personally love my Profilux quad doser. They are pricey but the stability that dosing pumps provider has made a massive difference to my SPS growth rate. I know there are some guys who brought in ones from ebay at just over R1K for a triple doser if I remember correctly.