Hi, I recently purchased your book, but left it at a friends vacation condo and will not get it back for another couple of weeks. Question is, I recently saw a West Marine catalog with an add for an "in-line treatment system". You install a "dispenser" between the water intake and the bowl, the chemical which comes in a solid is then released every time you pump. I will be following you books advise and replace hoses and the vent line but what's your though on this? It does seem to eliminate the need to add chemicals each week to the tank.Thank You..