Danner Manufacturing, Inc., Pondmaster 500 GPH Pump, 02525

We have about a large fish (about 50 gal) pond outside and needed to replace the pump. We purchased this one and it works perfectly.

I have three model 3s of this style pump in my 150 gallon tanks. They pump water efficiently, helping to keep the tank clean. I haven't had any issues with clogging, the hard pre-filter protects them and any fish from being suctioned and injured or killed. I build my own cannister filters, this was a great addition.

Danner/Pondmaster make the best magnetic drive pumps - period.I want to say something more than "it just works" - Which really doesn't say much. This I can say from both an experiential and engineering viewpoint. I have over 45 years experience with aquariums, 10 years experience with a medium (>3000g) outdoor pond, and many outdoor water features. I have used Pondmaster and Danner mag-drive pumps for these applications, along with a few regrettable choices. As far as from a construction standpoint, these are a well made pond 'feature' pump or statuary/waterfall pump expected to run 24x7x365. To say I have 'abused' these pumps is an understatement: I have run one or more of these dry, in freezing ponds and fountains (although with pond warmers), and salt-water aquariums - No problems. Even with this type of treatment these pumps have ran for an average of 2.5 years without problems. Initially these pumps had problems with wear in the cover/stem area - this has been redesigned and reinforced for longer life.I recently replaced a Danner 500gph pump in my backyard fountain, which was retired from pond duty after 3 years, sat on a shelf for a year, and ran another two years. The cause of the failure? ....a broken shaft. A bonus is that these are extremely easy to rebuild. I will rebuild this pump with another impeller assembly and cover, and I will have a reliable spare for when or whatever.HIGHLY RECOMMENDEDUpdate 24 July 2018: Already rebuilt, tested, and re-boxed. :-)

My old pond pump died and I upgraded from 250 GPH to this pump. Not only runs my pond but was so powerful I was able to add a double drop waterfall. Love my pond even more now.

Good pump but over proced

Works well for my backyard 60 gallon fountain

The year was 2014. The project was to restore an unkept pond at the new house. I had the time but not a lot of money. I had to redo everything with the pond stone, by stone, new liner, and of course a new pump. I did a bit of research and decided to go with this one. This pond also ended up becoming the sump tank for my aquaponics system.At first, I used 2 separate pumps, one for the waterfall and the other for the system. After the smaller, cheaper pump failed, I redid the piping to just use this pump for both. I have had a few half-dry runs when the pump has drained the pond due to an issue with the piping, ( poor fish, didn't know what was going on). The pond and system have frozen a few times. But the pump has never let up or failed.SO 8 years later and the pump is still moving plenty of water throughout the pond.

Works great

if i was using pump submerged i wouldn't have noticed but i'm using it inline and it leaks from what i discovered was a crack in the impeller housing.