Optimal Resin & Gravel Levels by Tank Size

The following table provides the optimal amount of resin and gravel underbed required for a water softener system based on the system media tank size.
Tank Size Amount of Resin  Gravel Underbed
8" x 35" 0.64 cubic feet None
8" x 44" 0.75 cubic feet None
9" x 35" 0.75 cubic feet None
9" x 40" 1.00 cubic feet None
9" x 48" 1.00 cubic feet None
10" x 35" 1.00 cubic feet None
10" x 40" 1.00 cubic feet None
10" x 44" 1.25 cubic feet Optional - 16 lbs.
10" x 54" 1.50 cubic feet Optional - 16 lbs.
12" x 52" 2.00 cubic feet Optional - 20 lbs.
13" x 54" 2.50 cubic feet Recommended - 35 lbs.
14" x 65" 3.00 cubic feet Recommended - 40 lbs.
16" x 65" 4.00 cubic feet Recommended - 50 lbs.
18" x 65" 5.00 cubic feet Recommended - 100 lbs.
20" x 62" 6.00 cubic feet Recommend - 100 lbs. of 1/2 x 1/4 and then 50 lbs. of 1/4 x 1/8
21" x 62" 7.00 cubic feet Recommend - 100 lbs. of 1/2 x 1/4 and then 50 lbs. of 1/4 x 1/8
24" x 72" 10.00 cubic feet Recommend - 150 lbs. of 1/2 x 1/4 and then 100 lbs. of 1/4 x 1/8
30" x 72" 15.00 cubic feet Recommend - 250 lbs. of 1/2 x 1/4 and then 100 lbs. of 1/4 x 1/8
36" x 72" 20.00 cubic feet Recommend - 350 lbs. of 1/2 x 1/4 and then 150 lbs. of 1/4 x 1/8

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