{"product_id":"pentair-36-sqft-fns-plus-standpipe-assembly","title":"Pentair 36 SqFt FNS Plus Standpipe Assembly","description":"\u003cp data-path-to-node=\"0\"\u003eThe Pentair 36 SqFt FNS Plus Standpipe Assembly (part number 190035) is a critical internal fluid-distribution conduit engineered exclusively for the pressurized grid chamber of mid-capacity pool and spa Diatomaceous Earth (D.E.) filtration systems. This structural PVC pipe pillar is standard hardware for the Pentair FNS Plus 36-square-foot filter model (FNSP36), where it functions as the central spine of the internal filter matrix.\u003c\/p\u003e\n\u003cp data-path-to-node=\"1\"\u003eInjection-molded from a heavy-walled, high-impact, and chemically inert polymer compound, the standpipe column measures approximately 10-3\/8 inches in vertical height. Its primary operational role is to establish a secure, bottom-anchored fluid return channel inside the tank shell. The assembly seats directly into the lower bulkhead assembly and rises straight up through the center of the vertical filter grids, acting as the final collection backbone for clear, filtered water.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eDuring the standard pool filtration cycle, water passes through the fabric-wrapped grid elements coated in D.E. powder, leaving behind micron-sized organic debris. This clean, pressurized water collects at the top manifold before traveling downward through the hollow, unyielding chamber of the standpipe, out the bottom tank outlet, and back into the pool return lines. Conversely, during backwash flow reversals, the standpipe handles turbulent, high-velocity incoming water to assist in purging spent D.E. media away from the grid pleats.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThis robust construction enables the internal plumbing core to safely handle continuous system operating pressures up to 50 PSI without hairline cracking, joint weeping, or experiencing stress-induced detachment under extreme pump vibration surges. Designed to remain permanently submerged in a highly dynamic, chemical-rich aquatic framework, its durable plastic framework completely resists structural warping, material brittleness, and corrosive breakdown from exposure to high-strength pool sanitizers like chlorine, bromine, and routine winterizing acid flushes. Due to its rigid, thick-walled cylindrical geometry and integrated sealing seat, this individual replacement standpipe outlet assembly carries a net product and shipping weight of approximately \u003cb data-path-to-node=\"3\" data-index-in-node=\"762\"\u003e1.25 to 1.50 pounds\u003c\/b\u003e (about 20.0 to 24.0 ounces).\u003c\/p\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":53416219312239,"sku":"190035","price":131.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/2798718_660070a7-1af2-45f3-b7e4-f6d92de2571f.webp?v=1782745906","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pentair-36-sqft-fns-plus-standpipe-assembly","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}