The Pentair Nautilus Plus D.E. 

One hundred percent premium-grade stainless steel tank eliminates leaks and minimizes corrosion. Unique grid design provides most efficient D.E. filtration available.

 Features:

• Backwashes from top to bottom, utilizing gravity for complete cleaning of accumulated dirt and D.E. powder.
• Exclusive grid assembly with molded-in handles lifts out easily for inspection and periodic cleaning.
• The Nautilus Plus D.E. Filter has a conveniently located 2" drain for easy and efficient cleanout.
• The all stainless steel tank closed with an exclusive clamping design, which is proven to be safe, strong, and reliable.
• Water flows in bottom, up, and around filter grid for even distribution of diatomaceous earth, eliminating bridging between elements and providing highly efficient filtration.