gills Posted July 5, 2007 Report Share Posted July 5, 2007 Hi everyone, I recently rang a pet shop(Pet World Ferry rd CHCH) enquiring about co2 check valves.I was told that they have some that are suitable and that as long as it is made of good quality silican and not rubber it's ok. Is this correct? The price for these was $5 odd. Quote Link to comment Share on other sites More sharing options...
fishandchips Posted July 5, 2007 Report Share Posted July 5, 2007 I think that sounds about right. I think there are some on trademe selling for around about the same price. You can also get metal ones, not sure how they work but i guess the same principle. Quote Link to comment Share on other sites More sharing options...
gills Posted July 6, 2007 Author Report Share Posted July 6, 2007 I think that sounds about right. I think there are some on trademe selling for around about the same price. You can also get metal ones, not sure how they work but i guess the same principle. Cool!!! Thats good, 'cause i bought one. Don't want my reg to rust and bottle to fill with water because of a $5 check valve :roll: :lol: Quote Link to comment Share on other sites More sharing options...
Warren Posted July 6, 2007 Report Share Posted July 6, 2007 I don't bother with one. Your regulators guts are made from stainless steel and will not rust. There's no way your bottle can fill with water as it means the pressure in the CO2 tank is less than in your aquarium - not really possible. I've been using CO2 for over 10 years and never had any issue with water going back down the CO2 feed line. Quote Link to comment Share on other sites More sharing options...
Freakyfish Posted July 7, 2007 Report Share Posted July 7, 2007 What do you use to diffuse the Co2 warren? I have a small powerhead that totally dissolves the Co2 but when the bottle is turned off at night without the check valve it blows water back up the Co2 line I think it would depend on what people are using as a diffuser whether they require a check valve Brad Quote Link to comment Share on other sites More sharing options...
Warren Posted July 7, 2007 Report Share Posted July 7, 2007 I now use a glass diffuser that requires quite a bit of pressure to make it work so water doesn't backfeed. I used to use the same method you are using with a pwerhead. I have a solenoid valve on the regulator output prior to the bubble counter and nothing used to backfeed other than 30-40mm up the tube from being off over night. I guess different circumstances don't guarantee you won't get backfeeding... Quote Link to comment Share on other sites More sharing options...
gills Posted July 8, 2007 Author Report Share Posted July 8, 2007 At the moment I just have a ladder for cos diffusion ( I'm doing the yeast thing) and I'll probably use the ladder for a while untill I get a better method so when I finally get the co2 system running I'll probably need a check valve. Quote Link to comment Share on other sites More sharing options...
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