Oase BioTec 18000 ScreenMatic² Pond Filter – Automatic Mechanical & Bio Filter for Koi Ponds up to 18,000 Gallons

The Oase BioTec 18000 ScreenMatic² (SKU 42975) is a premium automatic gravity-return pond filter for ponds up to 18,000 gallons without fish, 9,000 gallons with ornamental fish, or 4,500 gallons with koi. The ScreenMatic² technology uses a 300-micron automated belt to remove debris before it reaches the biological filter foams — an intelligent sensor detects buildup and triggers the cleaning cycle automatically. Max pump flow: 2,900 GPH. Dimensions: 31"L × 23"W × 21.5"H. Inlets: 1", 1¼", 1½" (adapters included). 3-year limited warranty (2+1 with registration). Qualifies for the Oase Clear Water Guarantee when paired with an AquaMax Eco pump and Bitron C 55C UV clarifier. DO NOT SUBMERGE — gravity-return filter must remain above pond water level. Oase Clear Water Guarantee (CWG): When the BioTec 18000 ScreenMatic² is properly sized, paired with an AquaMax Eco Classic 3600 or AquaMax Eco Premium 4500 pump and a Bitron C 55C UV clarifier, and registered online at oase-livingwater.com, Oase guarantees clear water visible to a depth of 3 feet. This is Oase’s industry-leading filtration performance guarantee. 18,000 Gal (No Fish) | 9,000 Gal Ornamental | 4,500 Gal Koi Auto 300-Micron Belt | LED Display | Manual Belt Button Max 2,900 GPH Flow 3-Year Limited Warranty (2+1 Registration) Clear Water Guarantee Qualified SKU: 42975 | Oase | 31"×23"×21.5"H | Gravity-Return | DO NOT SUBMERGE What's Included Filter System BioTec 18000 ScreenMatic² filter unit — automatic 300-micron self-cleaning belt; intelligent sensor-triggered cleaning; LED display; manual belt run button; 3 zones of biological filter foam (3 densities); Phosless cartridges for phosphate reduction Debris tray — collects coarse debris from automated belt cleaning Sludge drain — slide valve for easy waste removal without mess Hardware & Connections Inlet adapters: 1", 1¼", 1½" (three sizes included) Outlet adapter: 3" Foam cleaning tool — for periodic foam maintenance inside filter (no foam removal required) Transformer/controller for ScreenMatic² cleaning drive Hose clamps, gaskets, installation hardware, user manual Filtration Media Three-zone biological foam system — 3 different densities; large surface area for beneficial bacteria; cleans inside filter in pond water (no bacteria colony disruption) Phosless cartridges — bind and remove phosphate that drives algae growth; require periodic replacement Not Included / Optional Pond pump (required; recommended: Oase AquaMax Eco Classic 3600 or Premium 4500) Bitron C 55C UV clarifier (recommended for CWG qualification; mounts directly to filter inlet) Flexible or rigid pond plumbing from pump to filter Technical Specifications Specification Detail SKU / Model 42975 | Oase BioTec 18000 ScreenMatic² Pond (No Fish) Up to 18,000 US gallons Pond (Ornamental Fish) Up to 9,000 US gallons Pond (Koi / Heavy Load) Up to 4,500 US gallons Max Pump Flow 2,900 GPH Dimensions 31"L × 23"W × 21.5"H Inlet Connections 1", 1¼", 1½" adapters (all three included) Outlet 3" adapter (included) Filter Screen 300-micron automated self-cleaning belt; intelligent sensor-triggered; manual belt button Biological Media 3-zone foam system (3 densities) + Phosless phosphate-reduction cartridges Display Active LED display shows cleaning status and required maintenance Filter Type Gravity-return flow-through — DO NOT SUBMERGE; must remain above pond water level Warranty 3-Year Limited (2 years standard + 1 year with online registration) CWG Pairing AquaMax Eco Classic 3600 or Eco Premium 4500 + Bitron C 55C UV clarifier BioTec ScreenMatic² Family Comparison Feature 18000 (SKU 42975, this) 24000 (SKU 44120) 39000 (SKU 93036) No Fish 18,000 gal 24,000 gal 39,000 gal Ornamental Fish 9,000 gal 12,000 gal ~20,000 gal Koi 4,500 gal 6,000 gal ~10,000 gal Max Flow 2,900 GPH 3,300 GPH Higher Dimensions 31"×23"×21.5"H 31"×23"×25.5"H Larger Warranty 3-yr (2+1) 3-yr (2+1) 3-yr (2+1) Frequently Asked Questions How does the Oase ScreenMatic² automated debris separation work? The BioTec ScreenMatic² uses a 300-micron automated cleaning belt as the first filtration stage. Pond water from the pump enters the filter and passes through this fine mesh belt, which traps coarse and fine debris before it reaches the biological filter foams. An intelligent sensor mounted above the belt detects debris buildup and automatically triggers the cleaning motor — rotating the belt and depositing trapped debris into the removable debris tray. The tray is then removed and emptied as needed. A manual belt run button on the unit allows on-demand cleaning cycles without waiting for sensor activation. An active LED display shows the current filter status and indicates when cleaning or maintenance is required. What is the maximum pond capacity for the BioTec 18000? The BioTec 18000 ScreenMatic² is rated for three capacity tiers: 18,000 US gallons — decorative ponds with no fish 9,000 US gallons — ponds with a small/ornamental fish load 4,500 US gallons — ponds with a large fish load (koi) Note: The "18000" in the product name is the Oase model designation. In the US market, the filter's rated pond capacity is 18,000 US gallons (not litres). All capacity figures assume a minimum pond depth of 18 inches, continuous pump operation, and appropriate pump flow within the 2,900 GPH maximum. Does the BioTec 18000 require manual foam cleaning? The ScreenMatic² is designed for minimal manual intervention. The biological filter foams do not need to be removed from the filter for cleaning. An included foam cleaning tool allows periodic foam maintenance directly inside the filter housing, submerged in pond water — this preserves the beneficial bacteria colonies on the foam surfaces and minimizes water waste. For sludge and accumulated waste in the filter base, the slide valve on the sludge drain removes dirty water with minimal mess. The LED display indicates when cleaning is needed. Is the ScreenMatic² 18000 compatible with Bitron UV clarifiers? Yes. Oase Bitron C UV clarifiers mount directly to the BioTec 18000 ScreenMatic² filter inlet for integrated UV treatment before water enters the filter chamber. The Bitron C 55C is the recommended pairing for this filter size. When the BioTec 18000 is paired with an AquaMax Eco Classic 3600 or AquaMax Eco Premium 4500 pump and a Bitron C 55C UV clarifier, and properly registered at oase-livingwater.com, the system qualifies for the Oase Clear Water Guarantee (CWG) — Oase’s guarantee that the water will be clear and visible to a depth of 3 feet. Can the BioTec ScreenMatic² be buried to hide it? The BioTec 18000 ScreenMatic² is a gravity-return filter — cleaned water flows back to the pond by gravity through the outlet pipe. This means the filter must be placed above the pond water level. It cannot be fully submerged. DO NOT SUBMERGE. To conceal the filter, Oase offers the FiltoCap rock cover, which fits over the BioTec housing to blend it into the landscape as a decorative rock. This is the recommended concealment method for hiding the filter without restricting access for maintenance. Oase BioTec 18000 ScreenMatic² (SKU 42975) — 18,000 gal no fish | 9,000 gal ornamental | 4,500 gal koi | 2,900 GPH max | 31"×23"×21.5"H | 1/1.25/1.5" inlets | 3" outlet | LED display | Phosless | 3-yr limited warranty (2+1 registration) | CWG-qualified with AquaMax Eco + Bitron C 55C. Questions about sizing, pump pairing, or the Clear Water Guarantee? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.