Supreme Pondmaster AP-40 Pond Air Pump 2900 cu. in. per Minu

I've been using this pump for my outdoor pond for a few years now and it's great and still running.

It's easy to maintain, just don't let it get dirty and clean out the filter every now and then. The filter has easy access in the back of the pump. The original filter element becomes rather flimsy after a few washes and should be replaced from time to time. However, I don't think this is unexpected for any pump.

It comes with a plastic air manifold which not very good. It's probably better to buy a separate, quality manifold for distribution of air. Or you can modify it for temporary use until it breaks then you can get a quality manifold. The manifold itself, has too many outputs (more than efficiently necessary), none of which can be closed, so unless you're using them all, you're wasting a lot of air. I just used hot-glue to seal the outputs I didn't want to use. The manifold itself isn't even quality plastic so the outputs will eventually snap off especially if used outdoors.

Discounting the shoddy air manifold attachment, it's a great pump, with good output and easy care.

Update 4/14/2013:

The original plastic air manifold finally fell apart, the plasic was so brittle it was leaking air everywhere and I bought this metal air divider which is working great so far: Hydrofarm AAPADIV6 Active Aqua 6-Outlet Copper Air Divider.

Meanwhile, the air pump still runs like a champ.

I have a pond (or a pool, since it is pretty small) that needs some circulation--it has a muddy bottom and lot of leaves and other organic crud. I tried water pumps, but they always get clogged.

I got one of these, put a garden hose on it (cut off the ends and shoved them onto the pump and the aerator that came with it) and dropped the aerator into about 7 feet of water(with a brick to hold it down). It works great. In only a couple of days, the water is a lot clearer. It looks like the bubbles will be plenty to help the fish survive when the water gets low and during the winter.

This is made for a small pond. It is not going to aerate an acre, but it is still putting out a lot of air. The aerator is made so that you could connect a dozen aquariums to it, but they would need to be pretty big aquariums, since it puts out a LOT of air.

The only thing annoying is that I had to put it in an enclosure to protect it from the weather. It would have been nice if it had been weatherproof. Also, if you use it inside, the noise would probably drive you crazy. Outside, it is not a problem because you have to be pretty close to hear it.

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I have a six foot long, 150 gallon fresh water tank, and I'm using a combination of two bubble wands to form a five-and-a-half foot curtain of air bubbles in the background. The tank is 30 inches deep, and at different times, I've used a Tetratec Deep Water DW96-2 and a Super Luft SL-65 to drive the bubble wands, and an additional air stone. Both the Tetratec and SL-65 have been able to create bubbles, but were not able to create the curtain effect I had hoped for. A metal part in the SL-65 failed after about a year and-a-half,... the AP-40 was bought as a replacement. The Supreme Pondmaster AP-40 succeeded in creating the curtain of bubbles I was looking for, and is so effective, that I have to bleed off excess air though an open valve to atmosphere. Granted the AP-40 is more expensive than the other pumps, however my intent when I bought the other two air pumps was to find an air pump that could create the curtain of bubbles, (cost at the time was not a consideration). I believe I may have been able to achieve the same affect with the Supreme Pondmaster AP-20, but I wanted to err on the positive side. An added benefit,... the AP-40 I received is no louder than either of the other two air pumps. Great product. Very satisfied.

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Purchased pump about 3 years ago and it worked fine until it recently had a major drop in air pressure. I ordered a diaphragm kit assuming that would fix it. In the process of installing the kit I noted the cause of the pressure drop: the plastic base had a crack in it. I contacted Danner to purchase a new base and was told it was not a "saleable" item. They suggested I buy a new pump. Absurd! It's a plastic part I could replace in 5 minutes with nothing more than a phillips screwdriver. So I picked up some JB PlasticWeld (great product!) and patched the crack from both the inside and outside of the plastic base. So far that appears to have fixed it...pressure is great. Bottom line is this a very good item unless you need a replacement part they refuse to sell you.

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