Atlantic Eco-Blox Water Matrix- LG (27x16x17.5) universal but they have distinct advantages

but they have distinct advantages over those units

# 12756 : for model 12B (1200 GPH)

Dropper bottle for accurate dispensing of test solution

This low back pressure diffuser gives maximum air flow from the air pump

#11 cylinder x2

Atlantic Eco-Blox Water Matrix- LG (27x16x17.5) universal but they have distinct advantagesThe Atlantic Water Gardens Eco Blox Water Matrix provides water storage for pondless water features, bog filters, water harvesting and storm water reservoirs. Two or more Eco Blox can be locked together to fill part or all of a basin. Eco Blox hold more water in a smaller volume than gravel filled basins which saves labor, time and money. Featuring a 1 2" x 3 4" hole size, this water matrix block can be used with small gravel. One Eco Blox unit