I'm going to do a recirculating DWC with 5 gallon buckets. I'm working on connecting the drains on the buckets. Is there a reason I don't see many people using pvc and fittings? Most seem to use hydro store fittings and flexible irrigation tube. I'm planning on using a female slip x male thread from the outside of the bucket and a female thread x female slip on the inside, with grommets on either side. Then I can just use pvc sched40 pipe to connect the buckets. These parts are cheap and it seems easy. Will this work ok? Is pvc glue safe to use?