Originally Posted by billwilletts
Ok so here is another obvious choice - flexible PVC pipe - like they use on pools and hot tubs? It is all PVC but also flexible and the standard PVC fittings will glue right up. It looks just like sanitation hose too. PVC won't absorb smells either.
Hard PVC won't but flex PVC most assuredly will...It's highly gas permeable!
Flex PVC is ok for water, but not for sewage because the insides of hoses and plumbing are anaerobic environments. Water isn't organic matter full of bacteria that stinks when it breaks down anaerobically...sewage is. I've seen flex PVC permeate in less than 90 days. All the cheapest waste hose (sched 148) is flex PVC ...as is SeaLand's "odorsafe" brand, which I've also seen permeate in a very short time.
Trident 101/102 (identical except for color...101 is black, 102 is white) is a double walled rubber hose that has a biocide in the rubber formula. 101 has been on the market for nearly 20 years without a single reported odor permeation failure. 102's track record isn't that long only because it hasn't been on the market but about 10 years...it took 'em a while to figure out how to put a white "skin" on 101.
Which is why they're the only hose I recommend. Shields has one they've put a "lifetime" warranty on...but since the useful life of any hose--fuel, water OR waste--is only about 10 years because all hoses do dry out and become brittle with age, "lifetime" is just hype to justify a ridiculous price IMO. Raritan introduced a "new" hose a few years ago...made in Italy. It appears to be same hose that Vetus also sells under their private label brand name. I've never heard anything good or bad about Vetus hose...Raritan's hasn't been on the market but a few years, not long enough yet to recommend 'cuz I tend to stick with known track records, and 20 years with no reported odor permeation failures is by far the best track record for sanitation hose. And it's reasonably priced.
Hard PVC won't permeate, but it's best to use only in long straight runs, 'cuz short runs require a lot of unions, all of which can leak if subjected to enough stress and flex.