How to convert aquarium air pump to vacuum, Instructions

I needed a vacuum pump for making some FRP parts, so I modded an aquarium air pump for that.
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This design is the result of 3 or 4 prototypes and various airlift concepts, some of which you have seen in previous videos. It's great that an air pump can be used in this way. Don't bother with the fancy battery powered aquarium vacs out there, this works so much better!

This works SO well, you may need to be careful not to suck up any fry as you work with it inside your tank.

All of the parts are readily available at your local home improvement store, however, I may start to sell kits for really successful projects like this in the near future, so stay tuned for that!

If you like it, make one, and share the video with me! Do you own an aquarium? Would you like to help support this channel? Subscribe to My Aquarium Box to get the world's first subscription box for aquarium hobbyists delivered to your door once per month:

Aquarium Fish Tank Siphon Gravel Manual Cleaner Pump Safe Vacuum Water Change Air Pumps
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Hi - it's been done before - and i'm trying to build what was once built and is no longer being built.

I need a low volume vacuum pump - and the aquarium type were used for this particular gadget. 2Pcs Siphon Vacuum Pump Gravel Cleaner Aquarium Fish Tank Free Shipping
Photo provided by FlickrWholesale- Fish Tank Aquarium Vacuum Gravel Cleaner Water Change Syphon Siphon Pump Filter
Photo provided by FlickrAquarium Vacuum Pump
Photo provided by Flickr
This is a re-publish of a poorly done instructable that I posted a while back. Transform an aquarium air pump to create a weak vacuum This type of ...This instructable will show you how to turn a aquarium (blowing) pump into a vacuum pump.
The pump is a EHEIM 200 and costs about 10 dollars.
It's fairly easy to do and many other pumps work the same so you can apply this instructable to them as well.I recently bought a small aquarium air pump, not really realizing that “pump” in this case meant blowing air, not sucking. A quick search turned up almost no information online, but converting it into a vacuum pump turned out to be quite easy.Membrane pumps basically consist of a membrane, something to agitate it, and a pair of one-way valves. Turning the valves around also flips the direction of air flowing through the pump, turning a normal air pump into a vacuum pump.What can we expect from such a thing? Aquariums are usually less than a meter high, so a pump made for pumping air down to the bottom of such a thing should be able to provide a suitable pressure difference (about 10000 Pa, or 0.1 bar) just to get an idea about the magnitude.Turning it into a vacuum pump shouldn't change that significantly. Compared to a professional ("real") vacuum pump that doesn't sound like a lot (they go down to almost 1 bar pressure difference), but it's enough to be very useful.It turns out that the only thing to do was to rotate one part by 180 degrees.
A continous operation aquarium diaphragm air-pump can be made into a vacuum pump by enclosing it in an airtight container, and feeding the pumps exhaust air out of the container. End result is the pump evacuates the air inside the container, creating your bagging vaccum. We then add a suitable connector and hose to the outer chamber and connect it to the vacuum bag. My 90 L/hr (~23 gal/hr) pump is capable of pulling 5 inHg according to garage vacuum meter. 5 in Hg equals about 170 g/cm^2 or 2.5 lbs/sq in - or close to 1700 kg/m^2 or 360 lbs/ft^2.Adding an optional siphon pump allows owners to start a siphon without putting the entire hose into the tank or sucking on the hose to start the water flowing ― and risking a mouthful of aquarium water. Other options include longer vacuuming tubes and hoses, which allow owners to siphon the dirty water out a window or into a nearby sink or drain.