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    Thread: Air pumps

    1. #1
      two_wheeled is offline Senior Member
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      What's a better Air Pump

      Newbie question...
      What's the difference between these two kinds of air pumps?
      I've seen both in use in forum pictures, but don't know the benefits of either. I'm guessing #2 is quieter?
      Option #1:
      Name:  air pump 1.jpg
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      Option #2:
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      Last edited by two_wheeled; 07-17-2018 at 05:25 PM.

    2. #2
      icu2's Avatar
      icu2 is offline Administrator ~ WWKC Treasurer
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      #1 is a piston design and #2 is a diaphragm design.
      Piston is touted to last longer between needing a rebuild but it's usually more expensive to do when they
      eventually need it, and harder to do... and they are usually louder. #2 is quieter and usually is pretty easy and
      cheap to rebuild with a new diaphragm but normally lasts a year or two before needing one. The exception imho
      is the Medo pump which is a piston design and very quiet. But it comes with a steeper price tag. As they say,
      nothing is free.

      --Steve
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    3. #3
      Japan Koi Trips's Avatar
      Japan Koi Trips is offline Koiphen Kid
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      I recommend the first one all though it louder it'll be better for the fish in the future

    4. #4
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      I have the first pump and haven't used it in 5 years. It is way to loud but was very cheap for piston type. I love my Alita 40 liter and medo 80 liter pump. The medo is almost noise free

    5. #5
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      I use Medo piston Pumps and they are much quieter than diaphragm Pumps. I have 3 120's running in my pump house along with 4 Sequence pumps and all you can hear is the moving bed filters and the water cascading in the sieve.

      Other Sites Sale prices are our everyday prices.
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    6. #6
      icu2's Avatar
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      Quote Originally Posted by Japan Koi Trips View Post
      I recommend the first one all though it louder it'll be better for the fish in the future
      How would the first one be better for the fish in the future?
      I can live with the extra noise if it in fact is better for the fish in the long run.
      --Steve
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    7. #7
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      The 2nd also has a better air filter. The hydrofarm pumps are cheap and loud and better suited for hydroponics or like salmon fish farms. Cheap and deliver alot of air for the $

    8. #8
      two_wheeled is offline Senior Member
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      I have a 9" diffuser on top of my bottom drain. The diffuser has a 3/4" threaded connection.
      Can I connect pump #1 to the PVC line all the way to the BD, or is pump #1 not intended for this? It seems to provide plenty of air flow, but I can't find any examples of this type of connection online. It seems weird to me that the pump would have a small barbed connection.
      ?

    9. #9
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      Quote Originally Posted by two_wheeled View Post
      I have a 9" diffuser on top of my bottom drain. The diffuser has a 3/4" threaded connection.
      Can I connect pump #1 to the PVC line all the way to the BD, or is pump #1 not intended for this? It seems to provide plenty of air flow, but I can't find any examples of this type of connection online. It seems weird to me that the pump would have a small barbed connection.
      ?
      How many "lph" (liters per hour) is pump #1 rated?


      member

    10. #10
      two_wheeled is offline Senior Member
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      I haven't seen LPH used yet. I noticed that these two pump styles are never advertised using the same measurements.
      The cheaper (#1 pump) is usually rated in GPH.
      The better (#2 pump) is rated in cu.in/min or LPM.

      Roughly speaking, there are models of the cheaper #1 pump that supply anywhere from 570 GPH to 1750 GPH
      I think this equates to 41 LPM to 130 LPM. Or, 2157 LPH to 6624 LPH.

    11. #11
      BroHay is offline Senior Member
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      Depending upon depth, 2.5-3' is about the limit of pump one (700-900 GPH) to get good air flow. It can go deeper, but there is not the volume of bubbles as there is at shallower depths.

      I have a 120lpm pump that is on one of my DWC (Deep water culture beds - Aquaponics) and i have dropped an airstone is my koi tank @ 3'-5.5' with no visible difference in output.

      How deep are you tring to go in your pond for the aeration on the BD?

    12. #12
      two_wheeled is offline Senior Member
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      Less than 4 feet.

    13. #13
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      I have the 2nd one and the smallest model that gives 20-27lpm so the next number up would be ap40 = 40lpm+

      Itís been running for almost 5 years without skipping a beat and quiet enough for me to sit nearby with normal conversation

      I donít know how reliable drs brand is but some pretty good deals on air pumps
      https://m.drsfostersmith.com/product...m?pcatid=19012
      Last edited by OCkoiFan; 08-02-2018 at 09:49 AM.
      M.Nguyen


    14. #14
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      The #2 is better one.

    15. #15
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      I had a Dolphin air pump, if I remember the brand correctly, that looked just like No.1. It was so loud I gave it away. Could not stand the noise. Not to mention that it got too hot to touch. Now use an Alita diaphragm pump instead.


      Phil
      Last edited by phil hunter; 08-04-2018 at 07:48 PM.

    16. #16
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      Quote Originally Posted by phil hunter View Post
      I had a Dolphin air pump, if I remember the brand correctly, that looked just like No.1. It was so loud I gave it away. Could not stand with the noise. Not to mention that it got too hot to touch.
      Phil
      This describes my experience with Hakko pumps to a Tee. Switched to Medo and never looked back.

    17. #17
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      Go medo for your depth, I ran mine, a 45b for nearly 10 years before it needed a rebuild kit. It makes up for the 18 month run time on a atilla or other diaphragm pump in cost terms for rebuild kits and I have done both, piston is not hard to rebuild. And it will work fine for 4 feet. I run 2 spindrifters with 1 45b pistons drawback is depth, at 4 feet you will be fine.
      Regards, Ken

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    18. #18
      kimini is offline Senior Member
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      My Hakko diaphragm pump typically needed a rebuild roughly every year.
      Last edited by kimini; 08-09-2018 at 10:30 PM.

    19. #19
      ricshaw's Avatar
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      My two Hakko pumps have not needed rebuilding yet. Both are a couple years old. One does not get used full time.

    20. #20
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      I've been using a used alita for over 6 years now and haven't touched it. Filter etc... but I prefer my medo but it is more than I need. It is 80 liter and the alita is 40. Diaphragm pumps dont like excessive backpressure and shortens the life

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