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New air pump needed for small fish room, advise please?

PostPosted: Sun Dec 30, 2018 7:49 pm
by spotmonster
Hey all, long time no post.

My AP20 quit working 2 months ago after around..... uh, I'm not sure..2-3 years of use. I ordered a rebuild kit, but it didn't do any good, pump still had no air output. This upsets me as I ordered this pump knowing that I could rebuild it down the road. I've read of others that have had the same problem with rebuild kits not bringing their pumps back to life. So question 1, if you know of anything else that can be repaired let me know please.

Anyway, I picked up a used Gast P707 for 25.00 from Extravaganza I've been using as a spare. I think the Gast puts out more air than my AP20 did, but man is it loud. And I have not been unable to find out the wattage of this pump.
1/8 hp, Max Flow 1.6 cfm -1.9 cfm , Max Pressure 60 psi , Weight 14.5 lbs . Using a online conversion chart that rates this gast around 2764 CIM. Which is a little less than an AP40's 2900 CIM rating. I am successfully running 6 sponges in my rack, and 1 stone in my 55 on the next floor above it at the air output I'm looking for. If I crank everything down a little I may squeeze out 2 more sponges. But that would result in less than Ideal output than I want.
This pump is physically pretty massive. I expected it would do more than I wanted but it still doesn't perform as I had hoped. Don't get me wrong it's doing everything my AP20 did, perhaps a little more. But not want I need in my ultimate goal, which I will explain below. I will keep it for a back up down the road as it was an excellent deal for the 25.00 I paid for it.


Here's what I want to run. The pump's I'm looking at are the AP40, AP60, and AP100. My electric bill is sky high, so getting a pump that will do what I want but uses the least amount of $ is important. That's why I liked the 20 watt AP20.

I have (1) 6 foot rack running (4) 40 gal breeders, (2) 30 gal breeders= 2 sponges per tank for a total of 12 sponge filters. I have a 9ft loop built with 1" PVC right above this rack. Each tank has it's own valve on the loop. Everything coming off the loop are air lines.

I also have 1 line running up to my living room running 1 air stone in a 55 gallon. This line is probably 9 feet long.

I also want to run 2 open air lines in a 90 gallon that is about 7 feet away from the rack on the other side of the wall.

And if possible, this one may be impossible I know, run 2 open airlines in a 180 that would require a pretty long run, probably 2x15-20 feet.

I can scrap the idea of running the 180 if need be. It may not even be worth my time running the lines. Right now I have a small pump running the 180 solo.

My questions are :

Which AP pump will meet my needs?

Is my PVC too large, too small? Should I rebuild my loop in anyway?

I read how many sponges some of you run off of various pumps and it blows my mind. Am I doing something wrong or do I just need to step up to a bigger pump?

Re: New air pump needed for small fish room, advise please?

PostPosted: Sun Dec 30, 2018 9:48 pm
by Deeda
Nice to see you here again, it has been awhile!!!

I'm lousy at figuring out pipe sizes and air pump needs so I turned to John from Jehmco when we did our fish room and his recommendations for both items was spot on. I just gave him the number of outlets wanted per tank x the number of tanks and he recommended a linear air pump with a 3/4" PVC loop system. We are running 18 tanks (under 15" tall) with 2 air lifts (no airstones) per tank and using a LPH 60 linear piston pump with air supply left over.

If you aren't dead set on using the AP series pump, consider a Jehmco Linear Piston or even the lower priced diaphragm pumps.

I have a feeling that the 1" PVC diameter piping you are using may be a bit large, you have the volume but are losing a bit of pressure. Air stones do require more pressure to operate compared to just an open line on a sponge filter or air lift setup. Also deeper tanks require more pressure to operate for devices, even open air lines (no air stone).

Re: New air pump needed for small fish room, advise please?

PostPosted: Sun Dec 30, 2018 10:21 pm
by spotmonster
Deeda wrote: If you aren't dead set on using the AP series pump, consider a Jehmco Linear Piston or even the lower priced diaphragm pumps.


I'm not dead set, since the AP20 didn't last me very long. I'm looking at the Jehmco site now thanks.

Re: New air pump needed for small fish room, advise please?

PostPosted: Mon Dec 31, 2018 2:03 pm
by wryan
Another vote for Jehmco ... :thumb:

I'm currently running an older Jehmco DAPPH30 diaphragm pump, which I picked up used, in the fish room, on 8 tanks (one 55G, four 20G Longs, and three 10G's) with 10 sponge filters.

It makes enough air/pressure that I'm currently having to bleed air off ... and the filters are still bubbling quite vigorously. (Jehmco rates it 20 -35 outlets)

It's rated 40 watts on the name plate ... I did not notice any appreciable change in our electric bill when I put it in service.

I currently have it in the fish room and it's pretty loud in the room (IMO) ... but a big part of that is likely the hiss from the open nozzle on the manifold to bleed the air (Yeah, I know: I should stick some airline on it ... :lol: ) Eventually it will be located in an adjacent closet, once I get the hard piping in the fish room done.

A linear piston pump would likely be a lot quieter if you can go the ticket ... but these appear to be a good value for the money (IMO)

Re: New air pump needed for small fish room, advise please?

PostPosted: Mon Dec 31, 2018 2:37 pm
by wryan
BTW ... beautiful tanks ... especially love the 90G African "saltwater" tank ... :thumb:

Re: New air pump needed for small fish room, advise please?

PostPosted: Wed Jan 02, 2019 10:14 pm
by SantaMonicaHelp
I was going to try the Jehmco's, but went with the green outdoor pumps from AquaticEco. Not bad for the money, but have not run them next to other similar pumps; only next to small ones.

Re: New air pump needed for small fish room, advise please?

PostPosted: Tue Jan 15, 2019 1:59 pm
by BillD
I have been usig A Won brother linear piston pump for about 6 years. It does a dozen filters or more. The pump is the size of your fist. They are available under various brand names such as Eco or Coralife for about $40 or less. There are also a couple of larger models for a little more.
If you want to know the wattage of the Gast, check the amperage and multiply by the voltage. The pump I have is supposed to be 17 watts, but, I have seen claims by some that it was double that when checked with a meter. Regardless, I would buy another in a heart beat.