Use the Cubic Foot Blending Box to routinely calibrate soil mix lines so HydraFiber® and other raw substrate components are dosed at the right amount. The process starts with a fluffed baseline mix call of 1 cubic yard, then uses repeatable filling and leveling steps to confirm yield in cubic feet. If yield falls outside 26–28 cubic feet, the mix line must be recalibrated. Guidance also covers measuring peat-only percentages, a 60% peat: 40% HydraFiber example, and proper handling and dimensional checks to keep the Blending Box accurate.
Key Points
- HydraFiber and other raw substrate materials must always be in a fluffed state when measured, beginning with a 1-cubic-yard call using soil system controls.
- The Cubic Foot Blending Box is filled slightly above the rim, pockets are gently filled without compaction, and a straight edge is used to level substrate with the top of the box.
- A yield of 27 cubic feet +/- 1 cubic foot indicates acceptable calibration; yields greater than 28 or less than 26 cubic feet require mix line recalibration.
- Box care includes avoiding dents, periodically confirming internal dimensions of 12 in. x 12 in. x 12 in., and replacing damaged boxes with any material that maintains those dimensions.
