I have been using PVC
glue on tanks for years. I have run water through the lines in as little as 30 minutes after putting them together and have never had a problem. If you want a glue that sets faster, get the blue PVC
glue...it's usually called Rain'R'Shine and will set very quickly. Be sure you have the piping the way you want it though because once you put them together with this glue, they aren't coming back apart. I usually use the clear medium PVC
glue on white or gray PVC
. If you happen to be using any CPVC (the tan colored pipe), get the orange glue as it's formulated to work with this pipe better. If you do use the blue glue, be sure you are in a well ventilated area or you'll have a buzz followed by a headache. I wouldn't trust silicone on PVC
...it might work, but the glue is much better.