I just ordered my Atlas Scientific EC and PH stamps and would like to add some peri pumps for an automatic hydroponic/aquatic dosing system. There are some cheap pumps on Ebay - http://www.ebay.com/itm/peristaltic-pump-BABYFISH-w-DC-motor-tube-dc-6v-For-Aquarium-Lab-Analytical-/400569497462?pt=LH_DefaultDomain_0&hash=item5d43cd7776
I'm not sure whether to get the 6v, 12v or 24v and the differences between them (some 12v have a lower flowrate than 6v :S). And then which combination of MOSFETs/diodes to use. I would like 3 pumps one for each PH up, down, and nutrients.
The system contains 135-180 Litres with a 15-20L resevoir. The PH pumps probably need a minimal flow rate.. as even a drop of adjuster makes a huge difference to a litre of solution. The nutrient pump will need to be big enough for a full dosing (180L), 5ml of nutrients per litre of water, but still able to make smaller frequent (hourley-daily) doses.
Any advice please?