Thetford 03300 Aqua-Soft Toilet Tissue 2-Ply / 4-Pack Quantity 10 Specially-made for RV and marine sanitation systems - the "Must Use" toilet tissue from the #1 company in mobile sanitation! Tissue rapidly dissolves to prevent clogging in holding tanks Highly absorbent and 100% Biodegradable Convenient 10 Pack - 40 Rolls. Buy once for the season, and be done!