Joined: May 29, 2007 Posts: 2139 Location: Hyderabad
Posted: Thu Jun 19, 2008 11:38 pm Post subject: Made my second canister, check page 4
PLEASE CHECK THE REVISED FILTER FROM PAGE 3
After reading and contemplating about canisters, I couldnt keep myself from DIYing one. It took a lot of time, I was too busy sometimes, so the process stood on halt for long periods. Thats why I wasnt able to take the pics then.
I starting plotting the cheapest ways possible and posted some kiddish plans earlier, that used buckets / some odd containers, but neither seemed good enough for a big canister.
Finally I grabbed some PVC stuff and started off with the project. As I was totally a noobee in DIY stuff, I found it really complex to get the stuff around, things are called differently in the local market, its pretty difficult to communicate with those shop fellas, when you ask for something, their lil brains starts functioning in a different way, they ask the purpose(this is where all goes wrong), if its something different than usual(aquarium stuff is highly unusual for them), their minds stop at that instant, they are confused and they dont even agree upon giving you the thing even if they have it . In this situation I got acquainted to a LHS(local hardware shop) keeper who helped me a lot with patience, understood all the descriptions of stuff I gave and provided with all what I needed. Thanks to this guy, my project got going.
The mechanism is pretty simple as that of Eheim classic series(for example) - Water gets siphoned into the canister from bottom, passing through various media moves upwards into a pump situated at the top that throws the water back into the aquarium..... this idea was also adapted by Mr.Perikaruppan (I also thank him for clearing a few of my doubts at the beginning of the project).
So here it goes.....
PLEASE CHECK THE REVISED FILTER FROM PAGE 3
18" tall 4"dia PVC pipe with 4mm gauge
4"dia slip type end cap for base
4"dia threaded socket with lid for the top
3/4"dia PVC pipe
A couple of 1/2" ball valves
4" 'O' Ring to make the container air tight
A Good quality 'Chinese' air cooler pump 750lph
Some odd numbers of Nozzles(1/2"),
couplings(slip type, slip type to inner threading type)
1m 1/2"dia multipurpose hose pipe.
PVC cement, Araldite and silicon
All the above combined gave 7 simple parts that can be assembled and removed whenever needed with a little effort.
2-Lid with a pump
5-U-bends to go into the tank
A 3/4" hole was drilled at the bottom of canister for inlet, which was made pasting pvc couplings,elbow and nozzle together.
The 'O' Ring is an essential part, that keeps the system from leakage. Luckily I was able to find one which is used in heavy machinery for gas compression, pretty expensive though....
I was looking for union ball valves which I couldnt find, so I had to settle with the normal ones. which I permanently fixed using adhesives. These valves can be closed while cleaning, hence they save me from priming it every time I open the canister.
Further am looking for to get a pair of p.p. compression fittings, which are again a costly deal and can increase the cost of canister by 30-40%.These will provide ease in attaching and detaching the hose pipe. Now I have to wrestle a bit for pulling them out from nozzles.
I was thinking of using a 5 or 6"dia pipe for canister but they being very rare and their lids that are not found around, I didnt had patience to search them all, so went for 4"... will use a bigger diameter for next filters I make.
The pump has a slip type nozzle, so I drilled a 1/2" hole on lid, permanently fixed the nozzle, the pump can be pushed in to attach. this gives an advantage of removing the pump whenever needed for cleaning the propeller n other parts inside. The electrical chord passes through a 3-4mm hole on the same lid, hole is temporarily sealed using silicon(so that later the pump can be removed for claiming guarantee if needed).
The spray bar and the strainer attached to the U-bends
-This filter is for my 30g planted tank, thats why used a pump with minimum output.
-PVC cement should be only used for pvc-pvc joints, it'll not fasten pvc on any other mateial, so araldite was used for pvc-plastc joints.
-Dremel was an additional tool used to make quick n clean cuttings, hacksaw can be used otherwise for the same and later the surface or edges can be filed and sanded to give a neat look.
As of any equipment this has flaws in itself:
1-Its too narrow
2-The lid has to be tightly replaced after opening, to avoid leaks
3-To open the lid we have to make over a dozen rotations! but yet can be done once or twice a month.
4-The base cap is round headed, so am keeping a 4" coupling under it for now.
I have just completed the canister, which is being(and will be) tested for some more days, couldnt wait to post the pics....so started the thread.
I havent decided about the media yet....I guess I'll use non-fancy bio media, the pot scrubs, filter floss and sponge of less density...thats it for now.
At the end I can say.....It was a great experience creating a thing I havent used till now, finally, I have done it atlast! The HMC(home made canister) or Primitive canister...thats what I call it.
Looking forward to know your views.
Last edited by Hamza on Thu Nov 24, 2011 12:58 am; edited 5 times in total
Joined: Mar 04, 2005 Posts: 132 Location: Bangalore
Posted: Fri Jun 20, 2008 12:38 am Post subject: Re: My Primitive Canister Filter
Nice job Hamza.
I made a similar one 5 yrs back and it is now lying in my terrace.
The problem I found with this setup is that the quality of fittings we get in India is poor.
Eventually it leaks as these fitting are not designed for frequent opening and closing.
These are fittings used in sanitary lines and typically they are not opened for years.
So Good luck. I was personally never at peace at office thinking this might leak when I am not at home and office becomes my permanent home.
Joined: May 15, 2007 Posts: 2412 Location: Bangalore
Posted: Fri Jun 20, 2008 11:17 am Post subject: Re: My Primitive Canister Filter
This is one of the best DIY designs for an External Filter that i have seen. Great Stuff.....excellent detail, im sure quite a lot of people are going to benefit from this .... Will definitely try this when i get some time
Joined: Oct 25, 2006 Posts: 828 Location: Bangalore
Posted: Fri Jun 20, 2008 11:24 am Post subject: Re: My Primitive Canister Filter
Excellent Job !!!
My only concern is after you clean the hose pipes say 10-15 times the joint where you fix the hose pipe will become loose. This is critical because if that snaps out, you are going to drain all the water into your room. A quick fix to this can be to add one of those pvc screw cap and threaded pipes. you can tighten the cap over the hose pipe securely. This is how all the external canisters are built. Also I will suggest to raise the water inlet inside the aquarium to about half the height of aquarium so that even if there is an accident the filter won't drain the tank completely.
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