For the spiral one, I don't think the bubbles can be knocked out: the bubbles travel up the inside of the spiral tube: as they travel up the spiral they create a current which will drag water through the tube, the water that exits the tube will have the CO2 dissolved into it. If that makes sense?!
perfect sense! thanks
i thought it was a sort of open spiral that sits in the tank and the bubbles go up and round it, which would then obviously leave them prone to being knocked out of the spiral.
so if i sit it so that where they exit the tube is a high flow area so the Co2 enriched water gets blasted round the tank would that be good?