Thetford 03300 Aqua-Soft Toilet Tissue 2-Ply / 4-Pack Quantity 12 12 Packs of 4 Rolls (Total of 48 Rolls). Buy once for the season, and be done! 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