{"product_id":"pentair-cs400-semi-auto-backwash-controller-5-tank-system","title":"Pentair CS400™ Semi-Automatic Backwash Controller for 5-Tank Systems","description":"\u003cstyle\u003e\n.product-tabs__tab-content *,\n.rte *,\n.product-description *,\n.tabs-content * {\n  border-left: none !important;\n  box-shadow: none !important;\n}\n.product-tabs__tab-content details,\n.rte details,\n.product-description details,\n.tabs-content details {\n  border-left: none !important;\n  border-right: none !important;\n  border-top: none !important;\n}\n.product-tabs__tab-content summary,\n.rte summary,\n.product-description summary,\n.tabs-content summary {\n  border: none !important;\n  outline: none !important;\n  box-shadow: none !important;\n}\n\u003c\/style\u003e\n\u003cdiv class=\"cf-product\"\u003e\n\n  \u003cdiv class=\"cf-trust-strip\" style=\"display:flex; flex-wrap:wrap; gap:16px; justify-content:space-around; padding:16px; background:#f7f9fb; border-radius:8px; margin-bottom:24px; text-align:center; font-size:13px; color:#1a2b3b;\"\u003e\n    \u003cdiv\u003e\u003cstrong\u003e✓ Authorized Dealer\u003c\/strong\u003e\u003c\/div\u003e\n    \u003cdiv\u003e\u003cstrong\u003e✓ Free Shipping\u003c\/strong\u003e\u003c\/div\u003e\n    \u003cdiv\u003e\u003cstrong\u003e✓ Manufacturer Warranty\u003c\/strong\u003e\u003c\/div\u003e\n    \u003cdiv\u003e\u003cstrong\u003e✓ Expert Support\u003c\/strong\u003e\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cp style=\"font-size:17px; line-height:1.6;\"\u003eThe \u003cstrong\u003ePentair CS400™ Semi-Automatic Backwash Controller for 5-Tank Systems\u003c\/strong\u003e simplifies the backwash cycle of Stark™ and THS Series® commercial filtration systems equipped with diaphragm-valve face piping kits. With Acu-Trol® Intelligence, this programmable controller can backwash up to six filters in sequence via an integral multi-port pressure distribution valve — saving water, energy, and operator time on every backwash cycle.\u003c\/p\u003e\n\n  \u003cp\u003eA backwash can be initiated three ways: single-touch semi-automatic button, external signal from a master controller such as the Acu-Trol AK600, or an optional differential pressure switch for automatic backwash functionality. Features user-configurable settings, automatic calculated backwash cycle time, stored backwash data and history, alarms, heater cool-down (Fireman's delay), and valve control for pump and heater protection. Compatible with Acu-Trol AcuPort™ for network connectivity.\u003c\/p\u003e\n\n  \u003ch2 style=\"margin-top:32px; font-size:24px;\"\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv style=\"display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:20px; margin-top:16px;\"\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eThree Backwash Initiation Modes\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eSingle-touch semi-automatic, external signal from AK600 master controller, or optional differential pressure switch for basic automatic operation.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eUp to 6 Filters in Sequence\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eIntegral multi-port pressure distribution valve actuates diaphragm-style backwash valves using city water pressure or compressed air — up to 6 filters per cycle.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003e\"Advance\" Feature — Water and Energy Savings\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eSkips unnecessary backwash cycles — one of the most eco-friendly commercial backwash controllers on the market.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eAcu-Trol® Intelligence\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eAutomatic calculated backwash cycle time, stored backwash data and history, user-configurable settings, and alarms.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eHeater Cool-Down (Fireman's Delay)\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eValve control ensures pump and heater protection prior to backwash cycle start — standard safety sequence.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eNetwork Connectivity\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eConnect to networks via optional Acu-Trol AcuPort™. Compatible with Acu-Trol AK600 multi-body water chemistry and pump room controller.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eLCD Display\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eClear LCD interface for programming, monitoring, and alarm status.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3 style=\"font-size:16px; margin-bottom:6px;\"\u003eCompatible with Stark™ and THS® Filters\u003c\/h3\u003e\n      \u003cp style=\"margin:0; font-size:14px; line-height:1.5;\"\u003eDesigned for Stark™ and THS Series® filtration systems with diaphragm-style backwash valves.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2 style=\"margin-top:32px; font-size:24px;\"\u003eWho It's For\u003c\/h2\u003e\n  \u003cul style=\"font-size:15px; line-height:1.7;\"\u003e\n    \u003cli\u003eCommercial aquatic facilities operating Stark™ or THS Series® filter systems with diaphragm-valve piping kits\u003c\/li\u003e\n    \u003cli\u003eFilter rooms with up to 6 filters requiring automated or semi-automated backwash sequencing\u003c\/li\u003e\n    \u003cli\u003eOperations integrating with Acu-Trol AK600 master controllers or AcuPort™ network systems\u003c\/li\u003e\n    \u003cli\u003eFacilities seeking to reduce backwash water consumption and energy costs through intelligent cycle management\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2 style=\"margin-top:32px; font-size:24px;\"\u003eSpecifications\u003c\/h2\u003e\n\n  \u003ch3 style=\"font-size:17px; margin-top:20px;\"\u003eController\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; margin-bottom:16px; font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea; width:40%;\"\u003e\u003cstrong\u003eMax Filters Supported\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eUp to 6 in sequence\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eCompatible Filters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eStark™ and THS Series® with diaphragm-valve face piping kits\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eBackwash Initiation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eSemi-auto (button), external signal (AK600), differential pressure switch (optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eValve Actuation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eCity water pressure or compressed air\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eLCD\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003eBlue\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3 style=\"font-size:17px; margin-top:20px;\"\u003ePhysical\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; margin-bottom:16px; font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea; width:40%;\"\u003e\u003cstrong\u003eProduct Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003e25 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea;\"\u003e\u003cstrong\u003eShipping Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003e18 × 20 × 24 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3 style=\"font-size:17px; margin-top:20px;\"\u003eWarranty\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; margin-bottom:16px; font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:10px 12px; background:#fafafa; border:1px solid #eaeaea; width:40%;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px; border:1px solid #eaeaea;\"\u003e60 Days\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch2 style=\"margin-top:32px; font-size:24px;\"\u003eWarranty\u003c\/h2\u003e\n  \u003cp\u003eThe Pentair CS400 Backwash Controller comes with a 60-day manufacturer warranty. Clearflow Pool Supply is an authorized Pentair dealer and will assist with any warranty service needed.\u003c\/p\u003e\n\n  \u003ch2 style=\"margin-top:32px; font-size:24px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdetails style=\"padding:14px 0;\"\u003e\n    \u003csummary style=\"font-weight:600; cursor:pointer; font-size:15px; border:none;\"\u003eWhat is the difference between semi-automatic and automatic backwash?\u003c\/summary\u003e\n    \u003cp style=\"margin-top:10px; font-size:14px; line-height:1.6;\"\u003eThe CS400 is a semi-automatic controller — a backwash cycle requires a human action to initiate (pressing the button or receiving an external signal). With an optional differential pressure switch added, the controller can trigger automatically when filter pressure rises to a set threshold, providing basic automatic backwash functionality without full automation equipment.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"padding:14px 0;\"\u003e\n    \u003csummary style=\"font-weight:600; cursor:pointer; font-size:15px; border:none;\"\u003eIs this compatible with all commercial filter systems?\u003c\/summary\u003e\n    \u003cp style=\"margin-top:10px; font-size:14px; line-height:1.6;\"\u003eNo. The CS400 is specifically designed for Pentair Stark™ and THS Series® filtration systems equipped with diaphragm-valve face piping kits. It is not compatible with other filter types or brands. Confirm your filter system's piping kit configuration before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":48966671958267,"sku":"CS400-05","price":8950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0807\/4418\/6107\/files\/CS400.jpg.thumb.1280.1280.jpg?v=1781179656","url":"https:\/\/clearflowpoolsupply.com\/products\/pentair-cs400-semi-auto-backwash-controller-5-tank-system","provider":"ClearFlow Pool Supply","version":"1.0","type":"link"}