{"product_id":"reef-octopus-ks250-nilson-kalk-reactor","title":"Reef Octopus KS250 Nilson Kalk Reactor","description":"\u003cp\u003eThe \u003cstrong\u003eReef Octopus KS250 Nilson Kalk Reactor\u003c\/strong\u003e is a motorized kalkwasser stirrer built for large reef systems up to 320 gallons. A high-torque, low-RPM motor gently stirs calcium hydroxide inside an airtight 10-inch acrylic chamber, so you dose clear, fully saturated limewater that raises calcium and alkalinity together and holds a stable, high pH. Pair it with \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-reef-kalkwasser\"\u003eSeachem Reef Kalkwasser\u003c\/a\u003e or \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brs-kalkwasser-calcium-hydroxide\"\u003eBRS Kalkwasser\u003c\/a\u003e, and browse the rest of our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003ereef additives and supplements\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eWhy the KS250\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-torque stirring motor:\u003c\/strong\u003e the integrated 25-watt motor turns the mixing blade slowly and quietly, keeping the kalk in suspension without clouding the dose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight reaction chamber:\u003c\/strong\u003e the sealed lid keeps atmospheric CO2 out, so the kalkwasser stays potent instead of carbonating and losing strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge-scale pH stabilization:\u003c\/strong\u003e saturated limewater buffers and raises pH, supporting calcification in stony corals and helping precipitate excess phosphate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, clear dosing:\u003c\/strong\u003e undissolved particles settle at the bottom while only the clear saturated liquid at the top leaves through the output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4-inch quick-connect fittings:\u003c\/strong\u003e push-to-connect input and output ports take standard 1\/4-inch RO\/DI tubing for a fast, leak-free install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty acrylic build:\u003c\/strong\u003e thick, hand-polished acrylic with oversized thumb screws for quick, tool-free access when it is time to add powder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eFresh RO\/DI water enters the bottom of the reactor from your feed pump, rises through the bed of calcium hydroxide while the stirrer keeps it mixed, and exits the top output as clear, saturated kalkwasser that drips into your sump. The KS250 does not include a feed pump or a timer. Feed it with a dosing pump such as the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/ecotech-marine-versa-vx-1-single-dosing-pump\"\u003eEcoTech Marine VERSA VX-1\u003c\/a\u003e or with an auto top-off such as the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/icecap-ato-ez-auto-top-off-system\"\u003eIceCap ATO EZ\u003c\/a\u003e, and run the stirring motor in short intervals on a timer or an aquarium controller like the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/hydros-minnow-smart-controller-dual-dosing\"\u003eHYDROS Minnow\u003c\/a\u003e. The motor is rated for roughly 1,500 hours of run time, so it is designed for intermittent stirring rather than running continuously.\u003c\/p\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;max-width:640px;font-size:0.95em;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eReef Octopus KS250 (SKU OCT-KS250)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eRated aquarium size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eUp to 320 gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eBody diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e10 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eFootprint\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e12.6 in x 12.6 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eTotal height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e26 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eStirring motor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eIntegrated 25 W high-torque, low-RPM motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003ePower supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e120 V AC to 24 V AC transformer (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eInput \/ output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e1\/4 in quick-connect fittings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eHand-polished acrylic body with thumb-screw lid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eRequires\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eControl timer or controller and a feed pump (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e1 year on the reactor body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003e\u003cstrong\u003eWater type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:6px 10px;vertical-align:top;\"\u003eSaltwater and reef aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKS250 kalk stirrer body\u003c\/li\u003e\n\u003cli\u003eIntegrated 25 W stirring motor\u003c\/li\u003e\n\u003cli\u003ePower transformer (120 V to 24 V AC)\u003c\/li\u003e\n\u003cli\u003e1\/4 in quick-connect input and output fittings\u003c\/li\u003e\n\u003cli\u003eInternal stirrer arm and shaft\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-reef-kalkwasser\"\u003eSeachem Reef Kalkwasser\u003c\/a\u003e, calcium hydroxide powder for the reactor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brs-kalkwasser-calcium-hydroxide\"\u003eBRS Kalkwasser (Calcium Hydroxide)\u003c\/a\u003e, bulk calcium hydroxide powder\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/ecotech-marine-versa-vx-1-single-dosing-pump\"\u003eEcoTech Marine VERSA VX-1 Dosing Pump\u003c\/a\u003e, a precise feed pump for the reactor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/icecap-ato-ez-auto-top-off-system\"\u003eIceCap ATO EZ Auto Top-Off\u003c\/a\u003e, for feeding the reactor with top-off water\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/hydros-minnow-smart-controller-dual-dosing\"\u003eHYDROS Minnow Smart Controller\u003c\/a\u003e, to schedule the stirring motor\u003c\/li\u003e\n\u003cli\u003eMore \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003esaltwater and reef supplies\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the KS250 come with a pump?\u003c\/strong\u003e No. It ships with the reactor body, motor, transformer and fittings. You supply the feed pump (a dosing pump or ATO) and a timer or controller for the motor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I run the stirrer all the time?\u003c\/strong\u003e No. The motor is rated for about 1,500 hours of operation, so stir in short intervals on a timer or controller and let it rest between cycles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat tubing does it use?\u003c\/strong\u003e Standard 1\/4-inch RO\/DI tubing with the included push-to-connect fittings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size tank is it for?\u003c\/strong\u003e The 10-inch body is sized for large systems up to 320 gallons. Kalkwasser supplies calcium and alkalinity in a balanced ratio and raises pH, but tanks with very high demand may still need supplemental two-part dosing.\u003c\/p\u003e","brand":"Reef Octopus","offers":[{"title":"Default Title","offer_id":49312841924827,"sku":"OCT-KS250","price":785.39,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/ks-250_1.jpg?v=1789495023","url":"https:\/\/squeakysaquatics.com\/products\/reef-octopus-ks250-nilson-kalk-reactor","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}