Red Flint Gravel, 1/2" x 1/4", 100 Bag

Red Flint support gravel in the 1/2" x 1/4" grade, packaged in a 100 lb bag. This coarse, high-density silica gravel is used as the bottom support bed (underbedding) in backwashing water filters and softener mineral tanks, holding the finer filter media above the distributor and preventing it from washing into the underdrain.

• Product: Red Flint underbedding / support gravel
• Grade: 1/2 inch x 1/4 inch coarse particle size
• Package: bulk 100 lb bag
• Role: bottom support layer beneath the primary filter media
• Properties: dense, hard, sub-angular silica with very low acid solubility
• Keeps the distributor basket clear and stabilizes the media bed during backwash

Load this coarse grade first as the base layer in a mineral tank, then add progressively finer gravel and your working media on top. A common choice when bedding calcite, filter media, or softening resin in residential and light-commercial tanks. Sold by the 100 lb bag; order enough to build the support bed to the depth your tank size requires.