I’m also dosing on a budget.. I have one of the BRS dosing pumps on a mechanical timer for my Kalkwasser and 2 of the CoralBox dosing wifi dosing pumps for my calcium and Alk, my mag just gets added to my ATO revisor. To stay within my reefing budget I purchased pumps separately over time and was able to catch everything on sale for a total of about $150 invested.. I’m extremely happy with my choices.