HALF OFF PONDS MatrixBlox Water Storage 3-Pack — 31.5 Gal Interlocking High-Capacity Blocks for Pondless Waterfalls

HALF OFF PONDS MatrixBlox 3-pack provides compact, high-capacity underground water storage that supports pondless waterfalls, bog chambers, or subsurface irrigation with a combined 31.5 gallons per pack.

These modular Water MatrixBlox are engineered to create high-volume, weight-bearing reservoirs beneath landscape features so you can build smaller, cleaner basins without sacrificing water capacity. Each block’s honeycombed interior saves space with up to 96% void volume, and the rugged interlocking design handles surface loads so you can finish the project with pavers, gravel, or turf. This bundle includes three units sized to fit a variety of lined excavations and to be stacked or arranged in custom configurations for almost any basin depth or footprint.

How much water does the 3-pack actually hold?

The three-block bundle delivers 31.5 gallons of stored water when installed as intended. High void ratio means more water in less space, letting you reduce basin excavation and liner area compared with loose rock or single-chamber tanks.

• Combined capacity: 31.5 gallons for the 3-pack
• Individual block dimensions: 28" x 17" x 15.5" for predictable layout planning
• 96% internal void for efficient volume per footprint

How do these blocks perform under landscaping and foot traffic?

MatrixBlox are built to lock together and distribute loads to allow finished surfaces directly above the reservoir. Once assembled you can cover them with soil, gravel, pavers, or sod without special protective layers, depending on load demands. Their sturdy geometry prevents collapse while maintaining the internal storage voids.

• Interlocking design secures multiple units into a stable platform
• Supports landscaping materials like pavers and gravel
• Works beneath turf or planted areas for discreet installations

Can I customize basin shape and depth with these blocks?

Yes — the modular format lets you arrange the blocks in linear runs, stepped tiers, or stacked columns to match your excavation. You can combine any number of units and mix levels to fit irregular footprints, making them suitable for narrow trenches, wide basins, or multi-level waterfalls. They also serve well as settling chambers under bog filters or planted features.

• Arrange blocks in any pattern to match the liner or excavation
• Stack vertically for deeper reservoirs or step for tiered designs
• Suitable for bog construction and settling chambers under plantings

What installation details should I plan for?

Install MatrixBlox in a properly prepared, lined excavation with stable bearing soil. Because the blocks are designed to retain water internally, ensure your liner is correctly fitted and sealed around the assembly. Simple mechanical locking means fast assembly on-site without special tools, though anchoring and backfill practices should follow local landscaping standards.

• Prepare a level, compacted base before placing blocks
• Use a compatible pond liner to fully contain the water reservoir
• Lock blocks together and backfill edge gaps as recommended

Who is this for? HALF OFF PONDS MatrixBlox 3-pack is ideal for landscapers, pond builders, and DIY homeowners designing pondless waterfalls, compact reservoirs, or planted bog filters who need high water capacity in a small footprint. It suits projects where load-bearing subsurface storage is required but excavation space is limited, and for anyone looking to simplify installation with modular, stackable components.