McMaster Carr sells peristaltic tubing by the foot.
Go to mcmastercarr.com then search for peristaltic tubing.
that's what this is, i just got it off amazon, which i did to test. from now on i can get it through work much cheaper.
i found this while searching for alternatives.
also this was mentioned by a tubing vendor. ( not at all related to spectrapure or anything, just in general )
Santoprene is a genral term for a Thermoplastic elastomers (TPE) which is a mix of polymers (usually a plastic and a rubber) I am not a big fan of it. Santoprene is a cheap thermoplastic that in my experince is prone to splitting. I comes on many commercial dosing pumps (aquamedic,ReefDoser and cheaper dosing pumps)
Santoprene tubing was developed for sale to peristalic degergent dosing companies that make automatic dishwashers and large scale laundry companies.
if you pump does have Santoprene tubing its no big deal you just have to watch it.
I would highly reccomend Norprene/Pharmed and if you can find it Marprene ( it is the best out there one tube lasts over 5 years with proper cleaning)
for the record, the Marprene he mentions is like $117 for a decent length piece, so obviously thats not really an option. LOL
but the pharmed stuff i got was $20 for like 60" on amazon.