BioStyle Replacement Filter Cartridge (Set of 4)

OASE BioStyle Replacement Filter Cartridge (Set of 4)

Keep your aquarium water crystal clear and your filtration system performing at its best with the OASE BioStyle Replacement Filter Cartridge Set of 4. Designed specifically for OASE BioStyle and BioStyle Thermo power filters, these convenient replacement cartridges deliver advanced 5-stage filtration to maintain a healthy aquatic environment for fish, shrimp, and aquatic plants.

Each multi-stage cartridge combines mechanical, chemical, and biological filtration in a single easy-to-install unit. The high-quality filter foam captures debris and suspended waste while providing a surface for beneficial bacteria to colonize. Integrated carbon, zeolite, and phosphate-removing media help eliminate odors, impurities, discoloration, excess nutrients, and harmful compounds from the water. A fine filter fleece provides the final polishing stage, trapping microscopic particles for exceptional water clarity.

Designed for quick, mess-free maintenance, the disposable cartridges slide easily into the filter chamber and can be replaced in minutes without handling loose filter media. Regular cartridge replacement helps ensure optimal filtration performance and consistently clean, healthy water conditions.

Key Features

• Genuine OASE replacement filter cartridges
• Compatible with BioStyle 20, 30, and 50 filters and BioStyle Thermo 30 and 50
• Advanced 5-stage filtration system
• Mechanical, chemical, and biological filtration in one cartridge
• Activated carbon helps remove odors and impurities
• Zeolite assists with water quality management
• Phosphate-removing media helps reduce excess nutrients
• Fine filter fleece polishes water for superior clarity
• Easy, mess-free cartridge replacement
• Includes 4 replacement cartridges

Ideal For

• Freshwater aquariums
• Community fish tanks
• Planted aquariums
• Routine filter maintenance
• Maintaining clear, healthy aquarium water

Replace cartridges every 4-6 weeks, depending on aquarium size, stocking levels, and filter performance, to keep your OASE BioStyle filter operating at peak efficiency.

• Free Shipping is valid for orders with a subtotal exceeding $199 and all orders will be shipped via UPS. Items purchased for delivery after 3pm will ship the following day. Items purchased for delivery after 3pm on Friday will ship Monday.
• Koi Fish and Live Plants only ship Monday- Wednesday. For orders placed after 3pm on Wednesday, the order will be shipped the following Monday.
• For Motor Freight (LTL) Shipments, oversized or heavy items unsuitable for traditional parcel delivery are not eligible for free shipping. These items will be dispatched through a motor freight carrier, as indicated on the product page. Once the carrier receives your order, they will reach out to arrange a delivery time. An individual aged 18 or older must be present to sign for the delivery.
• You may return or exchange an unused or unopened item for a refund (excluding shipping and handling charges) within 30 days of purchase. Following 30 days, the item may be returned in exchange for a store credit. Return shipping cost are covered by the customer and some items returned will result in a restocking fee. Please click here to review our returns policy.
• To receive a refund for Live Plants, you must email ecommerce@fitzfishponds.com with the image of the item in the original packaging for review.
• To ensure Live Plants have the best chance to arrive without issue, it is recommended to select next day air or two day shipping options.
• Used chemicals and fish food are not returnable. In addition, all sales on Japanese Koi are final and non-refundable. Should you have any questions or concerns when your fish arrive, please call 908-420-9908.