Advises needed for my next set-up

[matashi]

Anti siphon? How to do that?


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[Urban Aquaria]

Anti siphon? How to do that?

Most sump filtration setups i see install a one-way ball check valve vertically on the return outflow pipe that goes to the top tank, looks something like this:



Photo from Google Images.

Basically if the pump stops and water starts to siphon back down, the ball in the check valve will be pushed down to seal the valve, so it stops the siphon.

I guess if the outflow return pipe at the top tank is positioned at or above the water surface, there wouldn't be much issue of back siphon (though it'll be noisier with all the churning and splashing).

[matashi]

Ooh I see. Thanks for the clarification! I'm still thinking to make the top tank into something like hydroponics. Growing plants emerse with water dripping constantly. But scared Co2 will loose a lot. It's the top tank anyway, won't be viewing the tank much.


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[Urban Aquaria]

Ooh I see. Thanks for the clarification! I'm still thinking to make the top tank into something like hydroponics. Growing plants emerse with water dripping constantly. But scared Co2 will loose a lot. It's the top tank anyway, won't be viewing the tank much.

Thats a good idea... i guess you could simply put the emersed plants on floating rafts with their roots in the water, just like at the plant farms. Alternatively, you could also make a shorter stand-pipe outflow, then the water level will also become lower, then grow the plants in soil and shallow water like in a marginal/pond environment.

Co2 losses are easy to solve, just pump in more to compensate for the difference.

[matashi]

Exactly what I have in mind. That part is saved later for my itchy fingers to fiddle with


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[BFG]

Sorry to say this but 1 way valve does not work, had experienced this with even the +GF+ 1 way valve. The flaw of the 1 way valve is that gravity is constant. The moment the pump stop, the 1 way valve should be sealed shut. But, in my opinion, because the water in the pipes are not heavy ( even with salt water ), the flap does not sealed shut. This flap, which is the integral part of the process, lets in water in minute amount to pass. Over time, the minute amount turns to liter of water and your sump might be filled to the brim or worse, overflow happens.

Anti siphon is a process whereby you break the chain of water going down the pipes by introducing air into the pipes. Water being pump up the pipe from the pump, the pipe is fully filled with water, is a full siphon. When the pump is switched off and when the pipe ends where the water exit is underwater, the siphon can occur in the reverse flow, due to gravity. To break the siphon of water going down the pipes, you need to drill a hole in the pipe somewhere above the waterline. This hole, when the pump is activated, will have a small stream of water coming out, so it needs to be near the water surface. When the pump is off, this hole, due to gravity pulling down the water in the pipes, will pull in air through the hole as it is located above the water surface. As air is introduced into the pipe, it create gaps in the pipe, which break the water continuity, hence the siphon is broken.

[matashi]

Wow, something new to learn. Will take note of that. Thanks!


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[matashi]

Thats a good idea... i guess you could simply put the emersed plants on floating rafts with their roots in the water, just like at the plant farms. Alternatively, you could also make a shorter stand-pipe outflow, then the water level will also become lower, then grow the plants in soil and shallow water like in a marginal/pond environment.

Co2 losses are easy to solve, just pump in more to compensate for the difference.

Found this while browsing YouTube.
http://youtu.be/t-Xi9uOz2eU
Maybe can use for top tank emerse farm


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