Pentair 30" Tank Lateral Assembly

The Pentair 30" Tank Lateral Assembly (part number 21180-0100 or 211800100) is a specialized internal fluid-collection manifold engineered exclusively for the lower basin architecture of 30-inch diameter high-rate pool and spa sand filtration systems, designed specifically for the Pentair Sta-Rite Cristal-Flo T-BP Series sand filter (most notably matching the large-capacity T-300BP-2 model).

Injection-molded from a heavy-walled, high-impact, and chemically inert polymer composite, this assembly is positioned at the lowest point of the filter tank to serve as the structural extraction system beneath a heavy bed of silica sand or alternative media. Its primary operational role is to cleanly separate filtered water from the surrounding sand bed during the standard purification cycle. The assembly consists of a central distribution hub connected to a series of slotted radial lateral arms featuring micro-grooved slots that allow clear, pressurized water to enter freely while holding back fine media particles. The manifold consolidates these individual fluid streams and directs the water smoothly into the vertical internal standpipe and out through the pool return loops. This balanced hydraulic arrangement maximizes flow velocity and minimizes back-pressure, allowing the complete system to easily manage high-velocity circulation and sustain continuous internal operating metrics up to 50 PSI without weeping, experiencing structural warping, or cracking under sudden pump vibration surges or aggressive backwash flow reversals. Built to remain permanently submerged under hundreds of pounds of dense media, its rugged composite design completely resists material brittleness, stress-cracking, and advanced corrosion from prolonged exposure to high-strength pool sanitizers like chlorine, bromine, and salt-chlorine generator outputs. Due to its wide-spanning radial configuration and reinforced central plastic plumbing connections, this complete 30-inch tank lower lateral assembly carries a net product and shipping weight of approximately 2.25 to 2.80 pounds (about 36.0 to 44.8 ounces).