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Children Boogie
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Discussion Starter · #1 ·
I'm liking the aqueon water changer but it's falling apart on me so I decided to build an indestructible version. I really like the valve feature to direct the flow of water.



Forgive me if I have some of the names wrong.



One warning, I don't think this will fit in a typical bathroom sink. It's a bit long (7"-8"). And the reason why I used that type of hose nip is because it's useful to detach the hose when attaching the fixture to the faucet.

total price: I think $28
 

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Have you tested it? I think it will be fine for filling, but since it has no eductor/venturi, it won't be able to create suction. If the discharge is low enough, it should be able siphon like a plane hose (use the tap to charge the hose then turn the tap off).

Here is a company that makes eductors and a cut-away view
http://www.nciweb.net/eductor1.htm
 

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Children Boogie
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Discussion Starter · #3 ·
yeah, I was worried about the venturi too but it worked. All that's needed is a difference in pressure. I blasted the faucet and once the syphon started, I turned off the faucet and let gravity do the work. I made this last weekend and waited for today's water change to test it out. I was going to reuse the metal fittings if it didn't work out.

But a pvc venturi would work better.
http://www.flexpvc.com/cart/agora.cgi?cart_id=9783.2906*8n7dz2&product=PVC-Venturi-Tees
 

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Many hardware stores sell a jet pump for use with water beds. I use one of those for aquarium water changes. Works great, but I suspect not all that much better than this idea.
 

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Children Boogie
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Discussion Starter · #7 ·
Yeah, the venturi creates negative pressure drawing water from the tank.

I made one with the venturi pvc tee. It doesn't work that well.

A trick to get the suction to work without a venturi is to close the valve on the water changer to fill the hose with water, then open the valve. Suction will be automatically be made. This theoretical should work only where the tank is above the water changer.
 

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Which part is the eductor/venturi? This tapered section here?



Or is it this bottom section? I thought all this bottom flare did was create a nice dump shape for your waste water?



I put a female pipe thread-to-male garden hose adapter on mine so I can run a garden hose to fill my tank, I am not using it for draining or siphoning but I am wondering if that would even work with a 3/4" hose going to your gravel vac...now it would loose pressure I assume? Luckily I just use it to mix my water temp before sending it to my tanks:



Using your photo and guide here I went to the store and built my own here is my alteration so that I can basically link the Aqueon in the photo above with this DIY one. I am going to however swap out my 3/4" to 1/2" hose adapter to a 3/4" to 3/4" hose adapter on the waste discharge after the elbow and hope I can use the garden hose tap water from the Aqueon to start my siphon (this DIY valve will be under the tank by only a few inches). The waste water hose will fill a 5 gallon bucket for watering plants if this works:
 

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Children Boogie
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Discussion Starter · #9 · (Edited)
It looks like the venturi starts even before the tapered part. It ends where the water comes in. I have a broken one I can dissect in half to see. I don't have a dremel so that might make it hard.

Here's a drawing of it without me cutting one open.


Here's a picture of where I broke the water changer. It's glued with gorilla glue I think



It wasn't that hard to break. I just came off after a while.
 

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Alright so I did step up the 1/2" barbed nipple to a 3/4"



I have a 5 gallon bucket I drain my water into since my tank is too low to siphon into the sink plus I use it to water my garden and house plants. As you mentioned it does work if below the tank, I close the waste valve and open the fresh water valve until the hose it primed going to the tank. Close the fresh water valve, open the waste valve and vola it drains into the bucket, reverse the process and I can fill the tank I love it!

 

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How serendipitous! I came on because I want an easy way to drain the 60g we're breaking down and do some rapid fire water changes to clean out my 5g to combat an algae bloom and I was looking for DIY water changer ideas, figured I would have to search for a while!

So the only part I'm still unclear on, is what the Venturi does and is it definitely necessary for draining a tank that's not high up enough for Gravity draining? Thanks in advance!
 

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So the only part I'm still unclear on, is what the Venturi does and is it definitely necessary for draining a tank that's not high up enough for Gravity draining? Thanks in advance!
A Venturi valve will create a suction when a water flow passes through it. It's not a strong enough suction to lift water very far (water is actually quite heavy), so that's something to keep in mind if you can not siphon (gravity drain) your tank. In that case I'd suggest a small water pump:wink2:
 

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Children Boogie
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Discussion Starter · #14 ·
How serendipitous! I came on because I want an easy way to drain the 60g we're breaking down and do some rapid fire water changes to clean out my 5g to combat an algae bloom and I was looking for DIY water changer ideas, figured I would have to search for a while!

So the only part I'm still unclear on, is what the Venturi does and is it definitely necessary for draining a tank that's not high up enough for Gravity draining? Thanks in advance!
As long as the tank is above the water changer, you can create a siphon. If you have a pump, it would work faster.


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Children Boogie
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Discussion Starter · #15 · (Edited)
Alright so I did step up the 1/2" barbed nipple to a 3/4"

I have a 5 gallon bucket I drain my water into since my tank is too low to siphon into the sink plus I use it to water my garden and house plants. As you mentioned it does work if below the tank, I close the waste valve and open the fresh water valve until the hose it primed going to the tank. Close the fresh water valve, open the waste valve and vola it drains into the bucket, reverse the process and I can fill the tank I love it!
Nice setup. Also if you put a carbon house filter on the incoming water, you can remove chlorine. No need to shock your fish or use dechlore. The water rate has to be a little slower to be effective with removing chlorine.


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A Venturi valve will create a suction when a water flow passes through it. It's not a strong enough suction to lift water very far (water is actually quite heavy), so that's something to keep in mind if you can not siphon (gravity drain) your tank.
So just using a regular T junction and valve won't work as well? The faucet is below the tank, I just don't have a drain and I don't relish the idea of draining an entire 60g tank one 5g bucket at time.

In that case I'd suggest a small water pump:wink2:
As long as the tank is above the water changer, you can create a siphon. If you have a pump, it would work faster.
I would much rather spend a few $ on a couple pieces of PVC than buy a pump, especially because for cleaning the 5g I want to be able to refill and drain it quickly, not sure a pump would work for the refill part? So unless a filter can be repurposed as a pump and I can use something I already have, I think I'm interested in a DIY python / aqueon type water changer :) (if you can tell me how to repurpose a filter for the task, I am guessing that would make draining the 60g even faster so I'm all ears! ;))
 

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So just using a regular T junction and valve won't work as well? The faucet is below the tank, I just don't have a drain and I don't relish the idea of draining an entire 60g tank one 5g bucket at time.
Depending on how much lower the tank sits it may not work at all, in theory a tee joint will work if you need only a very gentle suction, the greater the suction needed the more constricted the intersection needs to be.

You could run a hose to a floor drain, or out a door, even into a toilet:wink2:



I would much rather spend a few $ on a couple pieces of PVC than buy a pump, especially because for cleaning the 5g I want to be able to refill and drain it quickly, not sure a pump would work for the refill part?
If you get a pump meant to be used externally it certainly could work, though why not just hook a hose straight to the faucet via a hose adapter?

So unless a filter can be repurposed as a pump and I can use something I already have, I think I'm interested in a DIY python / aqueon type water changer (if you can tell me how to repurpose a filter for the task, I am guessing that would make draining the 60g even faster so I'm all ears!
Using a canister filter could work, but your going to put more into DIYing such a setup that you'll have to struggle and finagle with than you would if you just bought a small external pump, garden hose, and an adapter to hook the hose to the sink than it's worth IMHO.
 

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Depending on how much lower the tank sits it may not work at all, in theory a tee joint will work if you need only a very gentle suction, the greater the suction needed the more constricted the intersection needs to be.

You could run a hose to a floor drain, or out a door, even into a toilet:wink2:
The bottom of the tank is probably about level with the faucet, I don't have a floor drain and the tank is in the basement so I can't run it out a door, otherwise I would :p I'm trying to make use of the laundry sink, but it's the kind on legs, not on the ground.

If you get a pump meant to be used externally it certainly could work, though why not just hook a hose straight to the faucet via a hose adapter?
You're right, I'm probably spending more time trying to figure out how to make a python type device to save money and do the water changes quickly than it would take to just drain the 5 into buckets and refill from the sink haha

Is the filter a canister? That should work easily. A HOB would be a pain.
Using a canister filter could work, but your going to put more into DIYing such a setup that you'll have to struggle and finagle with than you would if you just bought a small external pump, garden hose, and an adapter to hook the hose to the sink than it's worth IMHO.
Don't have a canister, just HOBs and smallish internal filters, and you're probably right about the finagling.

See how Teebo see up his water changer. That should work.
I will definitely take a look at that, thanks!
 

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@ Mistergreen - I am not holding any fish down here so the chlorine does not bother me but great idea! I assumed the plants were not affected by tap water, sorry to hijack your thread lol

@ Karackle - By the time you piece it all together not only will it be more expensive than an Aqueon but it will be close to the cost of a pump, checkout eBay for the Ecoplus 396 pump it has threaded inputs and outputs and makes a great project pump for $25!
 
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