What do you keep around for building and maintaining your UC systems?
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All my pipe is cemented, other wise it will leak. I use a pre-cleaner than lots of glue (it's cheap) I found that working with larger size pipe 3" and larger, for the cost of a bottle of pre-cleaner is well worth the money spent. When you pay 38$ for a 4" 90 you want to make sure it's well glued as there is no going back. Mistakes can be very expensive when dealing in larger sizes. I use the grey pipe which is over kill and about 4 times the $$ than the white Pool pipe. I use it cause the store is close by and being grey no mold grows on the outside like on the white pipe.
The uniseals are the Undercurrent's Achilles' Heel. While I value Woodsman's opinions and admire his skills, I've found that for me, 1" lines and fittings work fine and remain very affordable. Instead of uniseals, I use bulkheads, as these actually help to strengthen the bucket they're installed in. They're also easy to remove, repair- not that I've ever had to- and reconfigure your systems with.
I too have a bunch of spare parts, but they all fit my systems. A little planning and design in the beginning can go a long way towards keeping the parts count and cost down while still getting impressive results!
Lastly, if in doubt, go with fewer sites and longer on center distances- the girls will amaze you with how fast they grow and extra room is always appreciated for everything from lighting to air movement to just getting around in there.