{"product_id":"pentair-fns-plus-tank-bottom-36-sf-170016","title":"Pentair FNS Plus Tank Bottom Assembly 36 sq ft | FNS Plus DE Filter | 170016","description":"\u003cp\u003eThe Pentair Tank Bottom Assembly (170016) is the OEM replacement lower tank body section for the FNS Plus D.E. Filter in the 36 square foot configuration.\u003c\/p\u003e\n\n\u003cp\u003eThe tank bottom assembly forms the lower pressure vessel of the FNS Plus filter, housing the internal grid assembly and managing the flow of water through the D.E. filter media. When the tank bottom develops cracks, stress fractures, or compromised sealing surfaces — common after years of seasonal pressure cycling — the entire filter vessel loses structural integrity and cannot maintain rated operating pressure. Replacing the tank bottom restores the sealed environment required for proper D.E. filtration performance.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e170016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eComponent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTank Bottom Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, confirm the square footage of your FNS Plus filter — tank bottom assemblies are size-specific and are not interchangeable between the 36, 48, and 60 square foot models. The filter size is printed on the label affixed to the tank body. While the filter is open for tank replacement, inspect the tank top assembly, air relief assembly, and manifold O-rings for wear and replace as needed to avoid a return service call.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eCompatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.\u003c\/em\u003e\u003c\/p\u003e\u003c!-- wft:processed:manual:2026-03-30 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":51774100013331,"sku":"170016","price":489.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/PEN170016_0.jpg?v=1747698321","url":"https:\/\/poolaroo.com\/products\/pentair-fns-plus-tank-bottom-36-sf-170016","provider":"Poolaroo","version":"1.0","type":"link"}