Drain from pressure or suction side? - Equipment - Aquatic Plant Central

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Old 07-28-2018, 12:01 PM   #1 (permalink)
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Default Drain from pressure or suction side?

I'd like to make water changes easier by replacing my sipohn over the tank rim with a tap & valve into either the filter intake or output hoses. Which is better?

Pros, intake side:
* A simple siphon: turn the filter off, connect the drain hose, open the valve.
* Less chance of leak at the valve, since it's under suction when the filter is running. A leak or open valve would make air noises.

Pros, output side:
* Can use the filter pump to speed the draining process
* Filter change debris can go out the drain and not into the tank

Is there something I'm not thinking of? How to choose?

Thanks!
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Old 07-28-2018, 01:27 PM   #2 (permalink)
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Default Re: Drain from pressure or suction side?

If "better" means faster, then I would put a two way valve, with one leg going to the usual filter output in the tank, and the other to a drain line outdoors to a flower bed. If "better" means less prone to doing harm, I would put that two way valve in the canister filter inlet line, with one leg going to the inlet pipe in the tank, and the other leg outdoors to a flower bed. (Turn off the canister filter if going this way).
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Old 07-29-2018, 01:50 PM   #3 (permalink)
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Default Re: Drain from pressure or suction side?

Thanks, Hoppy -- I think that's a better way to express my question, "what does 'better' mean?". Speed isn't it, so I'll look to the intake line.

BTW,I was planning to use a tee and a ball valve, but after you mentioned I have looked and looked for an appropriate two-way or diverter valve without finding anything. Any mfg or pointers?
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Old 07-29-2018, 09:21 PM   #4 (permalink)
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Default Re: Drain from pressure or suction side?

When I was doing a continuous water change system I found a 2 way valve on Ebay (used) and I installed it in my supply water line. That was a 1/4" plastic tube, so it wouldn't work at all on a canister filter line. I don't recall ever seeing a manual, 2 way, 1/2 inch or larger valve, but I feel sure they exist.
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Old 08-03-2018, 01:43 PM   #5 (permalink)
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Default Re: Drain from pressure or suction side?

I think you guys mean a 3-way valve?
http://www.usplastic.com/search/defa...%20way%20valve
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Old 08-03-2018, 03:27 PM   #6 (permalink)
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Default Re: Drain from pressure or suction side?

Quote:
Originally Posted by mistergreen View Post
I think you guys mean a 3-way valve?
http://www.usplastic.com/search/defa...%20way%20valve
Yes, you are right - oops!
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Old 08-04-2018, 09:15 AM   #7 (permalink)
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Default Re: Drain from pressure or suction side?

Quote:
Originally Posted by mistergreen View Post
I think you guys mean a 3-way valve?
http://www.usplastic.com/search/defa...%20way%20valve
Thanks for the link!
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Old 08-04-2018, 09:55 AM   #8 (permalink)
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Default Re: Drain from pressure or suction side?

Some of the new canister filters come with a 3 way valve built in for this purpose.
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