Hi, I am wondering is there some new innovations in chiller technology at the moment.. -chiller what can be installed inside the tanks..for big tanks like 50 gallons size.. -chillers outside the tanks but VERY QUIET ! and effective.. I am running at the moment probably the overall quietest systems there is on the market Hailea HC150A I have 2 of these..one of them is quieter than the other, the other louder one is newer, I even sended it back and had it changed to an other piece because I thought it wasn't 100% healthy.. the replacing one was a bit better but still a bit louder than the older one.. I think because they are chinese made ,they have started to save in some production steps and that's why they are louder than before... Anyway...I would love to get couple of super whisper quiet machines to do the job... it freaks me out to have any machinery causing constant on and off sound of surring and humming..