GreenNeedle
Member
I noticed this statement on another forum and wondered what people's thoughts on it were. I remember we came to the conclusion that the manufacturer's gave a maximum lph based on what the powerhead on it's own could achieve but these statements contradict this.
The poster was suggesting that Eheim's lph were lower for their cannisters because they were more honest about them.
after a thread on this forum, we contacted, Eheim, Fluval/Hagen and Hydor, to find just how they measure their cannister flow rates.
Eheim do their test with a full set of "recommended" media 50cm of pipe on each side. ( i use the recommended media, as do many others). they also give a head flow rate and a filter flow rate. they do not, and as far as i can find never have, rated their filters by the Power of the pump alone.
Hagen do theirs with no media and pipes of an undisclosed, but equal length.
Tetratech do their test with no media, and 1m of pipes
Hydor test with the supplied media (sponge and floss) and 1m of pipe.
If Eheims lph are lower due to be more honest then wouldn't this make their 50-60% in the test someone on here did even worse than the 50-60% the Tetratec achieved?
AC
The poster was suggesting that Eheim's lph were lower for their cannisters because they were more honest about them.
after a thread on this forum, we contacted, Eheim, Fluval/Hagen and Hydor, to find just how they measure their cannister flow rates.
Eheim do their test with a full set of "recommended" media 50cm of pipe on each side. ( i use the recommended media, as do many others). they also give a head flow rate and a filter flow rate. they do not, and as far as i can find never have, rated their filters by the Power of the pump alone.
Hagen do theirs with no media and pipes of an undisclosed, but equal length.
Tetratech do their test with no media, and 1m of pipes
Hydor test with the supplied media (sponge and floss) and 1m of pipe.
If Eheims lph are lower due to be more honest then wouldn't this make their 50-60% in the test someone on here did even worse than the 50-60% the Tetratec achieved?
AC