Hi Adam
I am currently trying to decide between the GRO TECH III NG (german pump) and the LiterMeter III.
The
TEC III NG comes with
three pumps and you can add more if desired up to a total of 11 different channels.
GroTech Aquarientechnik GmbH
Has 3 roller drive motor for precise dosing.
Min/max: 0-1999 ml/day.
Dosing frequency: up to 24 times per day.
Pumping height & distance: unknown
Warranty: unknown
Cost: $560 includes shipped.
The
Spectrapure LiterMeter III comes with
one pump and you can add more up to a total of 3 different channels.
NOTE: the new pumps are metal (stronger), the older models have plastic pumps.
Aquarium Fish
Has 3 roller drive motor for precise dosing.
Min/Max: 1.7 oz(50 ml)/26 gallons per day
Dosing frequency: Doses above amount over a 24 hour period in 150 increments.
Pumping height: can pump up to 60 ' above, can draw from 25 ' below
5 year warranty
Cost: $300 single pump, plus $140 ea additional pump ($580 for a three pump set, plus shipping)
I am leaning more towards the GRO TEC III NG because of its ability for variable dosing of 0-1999 ml/day. The litermeter III doses a minimum of 50 ml per day which may be too much for my balling complete dosages.
Also, per the reviews I have read, do NOT get any dosing pump that has only TWO roller drives. They are not precise and they may back siphon.
I hope this info helps you