Planted Tank Enthusiast
Join Date: Nov 2006
Location: Calgary, Canada
I don't have a direct link, I've emailed them for pricing on the unit I'd mentioned in my post. I'll update the board once I've seen the answer.
The 'strength' of the suction is adjustable and varies proportional to the flow going through the unit, in short the ratio of delivery is basically whatever you want it to be, if I remember right all the way from 1:20 to 1:1000. The issue is testing the variability of the unit, you'd definitely want the flow through the unit to be relatively constant or else your fert delivery would vary.
I did some test on mounting orientation on the ones I bought, they varied about 20%, I've yet to do the testing with them insitu under my tank but I've no reason to believe things will change. At first I'm going to run a series of tests to ensure there's constant delivery of solution each time the tank refills.
I calculated out the ratios to ensure that it would work before I bought them, basically at the limits of precipitation the ratio was about 1:700, so we'd want to shoot for a 1:350 or so.
Regarding clogging, they come with a very fine screen on the end of the tubing so I'd venture to say they're no more susceptible to clogging than an aqualifter.