Has anyone here ever used wide diameter pvc and made a sump out of several pieces, so that each individual piece contained different media, yet they were all connnected? Would this even work? When I say wide diameter I mean like 12"
When you get up to that size, PVC pipe is very expensive. On the us plastics website 12" diameter grey PVC is $27.87 per foot for schedule 40 and $46.03 per foot for schedule 80. And you have to buy them in 10 foot increments. the largest caps I could find were for 6" pipe, sch 40= $23.24 and sch 80 = $61.27
Yes, I've made several. Like awk says they are cost prohibitive and you have to do some tricky things with water flow. Machining Lids to fit is cheaper than purchasing them too.
The one or multi-tank method is by far cheaper and more convenient.
Now if you have full access to a machine shop and an uncle (that likes you) in the commercial plumbing business you've got it made.
I got about 10' of 12" PVC from a water treatment plant. I told them I had a project I was making and they said they had extra. Might be worth a shot lol. (I was making speaker enclosures)