DIY and Elite Pond Waterfall Boxes by Blue Thumb Select Size:Small Kills surface algae quickly without

Kills surface algae quickly without any water use restrictions

1 or 2 single-loop diffuser(s)

Ideal for pond owners

and phosphate-free

DIY and Elite Pond Waterfall Boxes by Blue Thumb Select Size:Small Kills surface algae quickly withoutElite Series Waterfall Boxes The octagonal design provides maximum strength, and a much easier shape to camouflage than circular or rectangle designs. With 2 bulkhead openings, pipes can be installed from either side. The second opening can be used as a back flush to perform water changes or connect multiple pumps or plumbing lines. The two included Matala mats have two times the biological benefit and will last up to four times longer than