Fleck 2510 - SXT with 12 Day Backwash Only Control Valve 120 Volt 60 Hz USA ( comes with 24 volt tranformer )
Include Valve Cover.
Back washing Valve commonly used on Carbon, Birm, and Calcite tanks.
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"Carbon Filter" assumes the media tank is using only Carbon with Gravel under bedding.
"Filter Backwash" assumes the media tank is using something "Heavier" than Carbon, such as BIRM, Calcite, Green Sand, Pyrolox, and Gravel under bedding.
And that is the reason for the higher Backwash Flow Rating per Tank Diameter.