Sand filter valves (4) are in “Filter” position, back pressure gauges read < 20 psi
If greater than 20 psi, do a backwash on that filter.
Tanganyika Wildlife Foundation
The Tanganyika Wildlife Foundation is a 501(c)(3) with the purpose of supporting exotic and endangered animal conservation and education efforts locally (via Tanganyika Wildlife Park) and around the world.
American Humane Certified™
Zoological Association of America