Does anyone know of an effective contact, mixing, chamber capable of fitting in the equipment compartment of a spa after a mazzei injector. I'm looking for something to use when retrofitting ozone on an older, non ozone equipped, spa with a 24 hour circ. pump. It would also have to be simpler and more effective than adding 10-12 feet of coiled vinyl tubing. I know Del makes their mixing and degas vessel that supposedly combines injection, mixing, and degassing, however, I'm concerned about the lack of contact time and the rapid saturation of the granular activated cartridge on the degas end of the system. I'm fond of the tried and true mazzei, and while there are plenty of contact vessels available for large scale systems I'm not aware of the availability of anything spa size. Thanks!