Hydor320 Universal Pump, 320 GPH - Original Seltz L30

I don't know why this pump has so many negative reviews. I've had a L20 for nearly 2 1/2 years now and never had a problem, so I'd say that qualifies as being reliable and a good value. I use it submerged in a bucket to transfer reconstituted RO water to my aquarium for water changes. From the floor to the top of the aquarium is just over 4 feet, which the pump handles just fine and it hardly makes any noise. I'm sure there are more powerful pumps out there, which some people may have a need for, but I don't. All I have to say is that compared to all the work I would've had to do lifting buckets of water by hand, this thing has paid for itself many times over!

Its doing a great job. Its submerged in the tank with a diy overhead sump filter (soon to have plants in it). This is the most effective filter set up I've found for my freshwater aquarium. Eventually it will be a 'closed' ecosystem with clay pebbles and plants in the sump.

It is quiet and powerful. I just thought it'll have a drain flexible pipe included. Nonetheless, works great.

The good, very quiet pump. I am running 2 of these (red ones, same pump) in the wet/dry sump of my 120G aquarium. both of these together make hardly any noise. They are replacing a RIO pump that has about the same flow as these 2 combined at it is very noisy compared to the L40s. (as the aquarium is in our bedroom, being quiet is a plus!)The only bad thing I have with these pumps is the way hose fitting tightens around the hose. Unless you use a very thick hose, the tightning nut does not do anything. I had to place some extra hose piece down in there for the nut to actually tighten. (Don't want the hose to blow off the pump!)The "othjer" bad - ordered this through Amazon warehouse deals as used - Very good condition. It is being returned as the impeller is not glued to the magnet, so it does not pump any water, just makes noise from the loose impeller. So sometimes the returns they resell were returned for a reason, they are broken (& not properly inspected before reselling to someone else.).

Runs very quietly and provides ideal flow for my 20 gallon AIO