Mix Box 20inch Replacement Filter System Set Compatible with Big Blue(4PCs)

Keep every drop of your household water pure and refreshing with the Mix Box 20" Replacement Filter Set. This targeted kit includes the two filter types that need replacing most often: 2 x 1 Micron Sediment Filters and 2 x Carbon Block Filters. Both are standard 20-inch x 4.5-inch cartridges, compatible with Big Blue filter housings.

Why this combination? In a typical 3-stage system, the sediment filter and carbon block are the workhorses. The sediment filter traps dirt, rust, and sand, while the carbon block removes chlorine, VOCs, and fine particles. These two stages do the heaviest lifting and clog or exhaust faster than the GAC stage. By buying them together in a 4-piece set, you can refresh your system more often at a lower cost - without paying for a full 3-stage kit every time.

Whether you're on municipal water or a borehole, this set protects your water heater, dishwasher, washing machine, and plumbing fixtures from sediment buildup. It also dramatically improves taste and odour. Installation is a straightforward DIY task - no need to call a professional.

WHY CHOOSE MIX BOX?

• 2 x 1-Micron Melt-Blown Sediment Filters - Acts as a sturdy barrier against visible particles like dirt, rust, and sand. Traps large volumes of debris without clogging quickly, so you get consistent flow and fewer mid-cycle changes. Having two in the kit means you're covered for two replacement cycles.

• 2 x Carbon Block Filters - Made from finely ground activated carbon compressed into a solid block. This dense filter captures remaining fine particles and provides extra chlorine reduction, ensuring your water tastes clean, bright, and free of any aftertaste. Two in the kit for extended use.

• Most Frequently Replaced Stages - In a 3-stage system, the sediment and carbon block filters typically exhaust first. This kit lets you replace them as needed without buying a full set every time.

• Protects Appliances & Plumbing - Safeguards your water heater, dishwasher, washing machine, and plumbing fixtures from sediment buildup. Regular replacement protects your housing and downstream equipment from premature wear.

• Standard Size - Fits Big Blue Housings - Each filter measures 20 inches (508mm) long with a 4.5-inch (110mm) outer diameter. Compatible with Big Blue (4.5 inch) filter housings and most standard 3-stage slimline systems.

• Easy Replacement - DIY Friendly - No need to call a professional. Replacement is a straightforward DIY task. For optimal performance, change the sediment and carbon block filters every 3 to 6 months. Heavier sediment or high chlorine levels may require more frequent changes.

PERFECT FOR:

• Whole-house water filtration systems;
• Big Blue 20" x 4.5" filter housings;
• Homes on municipal water with chlorine or sediment;
• Borehole or well water with dirt, rust, or sand;
• Protecting water heaters, dishwashers, and washing machines;
• Standalone use or integration with other water treatment systems;

ASSEMBLY & USAGE GUIDE:

• Step 1 - Shut Off Water Supply - Turn off the main water supply before replacing filters.
• Step 2 - Release Pressure - Open a downstream faucet to release pressure from the system.
• Step 3 - Remove Old Filters - Unscrew the filter housings and remove the old cartridges. This kit is for the sediment (first stage) and carbon block (third stage). If your system has a GAC middle stage, you can leave it in place if still within its service life.
• Step 4 - Clean Housings - Wipe the inside of the housings with a clean cloth. Check O-rings for wear and replace if needed.
• Step 5 - Insert New Filters - Place the new sediment filter in the first stage and the new carbon block in the third stage. Ensure they seat properly.
• Step 6 - Reassemble - Screw the housings back on hand-tight. Do not over-tighten.
• Step 7 - Flush System - Slowly turn the water supply back on. Open a faucet and flush for 5-10 minutes to remove carbon fines before use.

QUICK TIPS:

• Replace every 3-6 months - Depending on water quality and usage. Heavier sediment or high chlorine may require more frequent changes.
• Label your filters - Write the installation date on the filters or housing to track replacement intervals.
• Check O-rings - Lubricate with silicone grease if dry. Replace if cracked or worn.
• Flush after replacement - Always flush the system for 5-10 minutes to clear carbon dust.
• Use with Big Blue housings - Designed for 20" x 4.5" standard housings. Confirm your housing size before ordering.
• Store spare filters - Keep unused filters in a cool, dry place away from direct sunlight.

Color: White

Materials: PET,PP Cotton, Sintered Carbon

Compatible with (20inx4.5in) Filter Housings / Systems

Premium Sediment Size: 20 inch (508mm) x 4.5" (110mm)

Carbon Block Filters Size: 20 inch (508mm) x 4.5" (110mm)

Filter Life: 3-6 months (depending on water quality and usage)

Package Dimensions: 52cm x 24cm x 24cm (20.47in x 9.45in x 9.45in)

Weight: 7.4kg (16.31lbs)

Notes:

• This kit contains 2 sediment filters and 2 carbon block filters. It does NOT include a GAC (Granular Activated Carbon) filter. This is because sediment and carbon block are the most frequently replaced stages. If your system requires a GAC replacement, please purchase separately.
• Compatible with Big Blue (4.5 inch) Filter Housings / Systems.
• Filter Life: 3-6 months (depending on water quality and usage).
• Please allow for slight colour variations due to lighting and screen settings.
• Please allow for slight dimensional variations due to manual measurement.
• This product includes replacement filter cartridges only - filter housings and systems are not included.

What's in the box
2 x 1 Micron Sediment Filter 20 inch Compatible with BigBlue
2 x Carbon Block 20 inch Compatible with Big Blue
1 x Box