I am thinking of replacing my holding tank with a Purasan system. I did upgrade to the Elegance head a few years ago. I feel the holding tank and hoses need replaced so it makes the decision easier. I have read Peggy's book, increased the vent size and use odorless and am still tired of odors. I do feel we get more odors coming thru the head discharge then we did with the previous crown head. I did replace the discharge hoses probably 6-8 years ago so I'm sure they are due. Anyone have thoughts on the Purasan?