Hayward CX900DB Replacement Bag for DE Separation Tank

The Hayward CX900DB is the genuine replacement collector bag assembly for the Hayward DE separation tank.

What the bag is for

A separation tank sits between a DE filter and the discharge line. When you backwash, the water carries spent diatomaceous earth into the tank, the bag traps the DE and clean water leaves. Everything the tank does depends on that bag staying intact.

When to replace it

The tank shell outlives several bags. The bag itself is the wear item: it loads up, seams give way, and it eventually tears. If DE is showing up in the discharge water, or the bag will barely pass water even after it has been emptied and rinsed, replace it. This is the Hayward OEM part, supplied as the complete bag assembly.