Mr. Aqua’s Water Plant Soil is composed using specific proprietary blends of organic and inert ingredients providing all essential elements as well as a stable and ideal rooting media. The soil will also provide buffering capacities for softening water as well as buffering pH from 6.6 – 6.8 depending on water parameters. The soil is a long lasting fertilized plant substrate recommended for use up to 12-18 months. It purifies water that is stained from driftwood. It prolongs water exchange periods with its porous granular structure that is easily penetrated by plant roots. One bag Covers approximately: 36″ x 12″ at 1″ deep, 20″ x 11″ at 2″ deep Black in Color