i almost went the uniseal route. the only problem i read about was what you mentioned. if you start moving tubs around a bit, theycan get out of whack and leak.
that's another thing to consider on your end: are you prepared to join the "flood club"? i had a floor drain really close by just in case.
LOL, yeah I've had my experiences with FEMA (Flooding Everything in My Area). Taking every precaution this time around. I'm going to have overflow pipes on each bucket and the res. A small effort to prevent a huge disaster, that's for sure. I don't imagine there would be a flood of epic proportions by a leaking bulkheads or uniseals though so I don't think I need a drain inside the tent. The overflow will drain outside the tent. It's purpose is to account for possible root blockage where the bucket can overfill.
This will be in my 10x16 shop and I have no problem cutting holes in it for feeds, drains, a/c, fan exhausts, etc.... I'm having hot and cold water piped into a utility sink that'll be next to the grow. Going to have a rainbarrel outside (In OR we get tons of rain). That'll feed my res. I'll have two float valves. One for the rainbarrel feed, and then one set a little lower to allow for the upper res to kick in for times when the rainbarrel's empty. The line for the sink will feed the upper res. PPM is really low here so I'm probably not going to use RO.
I've done a lot with pvc. From grows to sprinklers. But it's been 8 years since I grew so I'm trying to catch back up on important details.
I am determined to build the perfect system. I'm an engineer so this is just another fun project to build
i had 2 of those 27 gal in a 3x4 area. was tight but they fit perfectly. and one outside as the control tub.
I'm still debating whether to have 4 tubs or two of those 39" long tubs. The individual tubs are 18 gallons each. But if I went with the two larger tubs, then we're talking 50 gallons each. I know more water is good because it helps keep a constant ph level, but is there a point where you can have too much water?
Thanks for all your help. All of this advice will certainly help me design a grow the way it should be designed.