Is there a check valve for water?

[Creetin]

i am asking as there is one for air to prevent the water from going into the air section but is there one that prevents water from going back into a pipe?

cos i t-off water from my output pipe into my calcium reactor but when feeding, the pressure from the water will cause the CO2 to stop bubbling. this happens when i switch on the pump after feeding has ended. the CO2 will stop bubbling and i have readjust the bubble rate again.

or issit due to my very stingy CO2 bubbling?

[Tanzy]

There are but they are big and liable to get blocked by calcium deposits resulting in a leaky seal. Will require regular maintenance. A hassle to be better of without. If possible consider alternative, check valve as last resort.

[cowgum]

Have used check valve in my tank for more than a year. The gap is much larger than in air check valve. So it's not that easy for the check valve to get clogged. Also remove any metallic parts in the valve as they will rest. i.e. metal spring. The valve will still work