Unicel S-1900 Circular Spin Filter Grid - 19 Inches pool-dimensions_14x28 This flat gasket measures 16

This flat gasket measures 16

The sensing ring is adjustable so that it can be controlled to activate only when an object the size of a child or pet falls into your pool

The ORP measures from -999 to 999 mV with an accuracy of plus/minus 4 mV

SD and SMD Series Sand Filters Models S7M120

It has a see-thru design so you can view debris on the pool floor

Unicel S-1900 Circular Spin Filter Grid - 19 Inches pool-dimensions_14x28 This flat gasket measures 16This is a Unicel S 1900 Ciricular Spin Filter Grid, 19 Inches in diameter with a 2 1 2 inch center. This round grid FC 9910 is the correct replacement for the Unicel S 1900. This filter grid is made from heavy duty polyester. This grid has more pleats to improve filtering capacity.