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should be something like 1/2 inch tubing for anything over 20 gallons grow rez. 1/4 inch tubing would do. Need a float valve in the grow rez and it goes str8 to the top up rez. The top up rez should be put higher than the grow rez, for gravity sake. and if you can afford it I recommend getting good brass hardware or at least use teflon tape at screw joints. I also add hose clamps to any barbed fitting connections.

if the top up rez can't be raised over the grow rez, it needs to be pumped. then you would need a electrical switch on the float valve, and those cost more obviously.
cool. thanks mate. im off to go see what a float valve is lol. ive got a 20L NFT gro tank that ill be adding an 80L top up res to. thought i could maybe just run a hose from a-b and connect it at the bottom of the tanks. my theory being that the 20L res would have enough pressure to keep it from overflowing. glad i asked now lol. illgo have a peek about then get back to you. cheers again bud : )
 
If I had anyone go fishing with around here I would..I do a lot of fishing in spring,summer & fall, both inland & ocean..
I love fishing, but going out on the sea makes me sick. I've never been able to sea fish without spending 90% of the time making chum off the back of the boat.
 
If I had anyone go fishing with around here I would..I do a lot of fishing in spring,summer & fall, both inland & ocean..

Mary Jane is the best ice fishing partner i have ever had!! :D :D :D
Though if you fall through the ice, she doesn't do anything to help!! Other than that she is the best! :D:D:D:D:D:D
 
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