Hello fellow fish heads. I just took down one of my tanks to add another tank to the system with it. It all will be down for a few weeks while i am building a double stand and plumbing it all and so forth. My quistion here is what is the best way to clean the inside of the pvc tubing, fittings, check valves, inline heaters and so forth all drain pipes and fitting 1 1/2 inch returns and inline heaters, check valve are 1/2 inch. i was thinking about soaking it all in vinegar and water but some pieces are pretty big and surely cant do that with inline heater. thanks for the input. all was just taking down tonight.