Hi all I've got a Kent 3 stage R.O. unit. The water collects in a large food-grade plastic vat. It's got a maxijet pump in it which attaches to a food-grade plastic hose, which is siliconed out of the tub and onto a hose-pipe connection which keeps the unit sealed. The water in the tub has a TDS of 001, but the pump and especially the hose are covered in a slimy transaparent substance. Does anyone have any ideas what it could be? Thanks!