Gravel Pumping & Backfilling FAQs

Our pneumatic system places material at distances of up to 300 feet and heights above 100 feet, at rates up to 22 yards per hour. Every site is different, so once we know your access and target, we can tell you quickly what is reachable.

We move dry, free-flowing materials such as sandy soil, sand, gravel, drain rock, pea gravel, and crushed rock. A simple rule of thumb: squeeze a handful and open your hand. If it falls apart easily rather than clumping, we can most likely blow it.

Dry-placed gravel drains better than controlled density fill and avoids the weight, cost, and disruption of heavy machinery on your site. For volumes up to roughly 200 yards, our service is often more cost-effective than bringing in a telebelt.

Yes. We stage from a safe, convenient spot and run lightweight pipe and hose through vents, gates, and around structures, even up onto rooftops. Tight backyards, ponds, and the sides of houses are exactly the places we are built for.

Absolutely. Our light-footprint method is designed for marshes, shorelines, tide flats, dense forests, and restoration sites where heavy equipment cannot or should not go, letting us place material cleanly while protecting the surrounding environment.

Up to about 300 feet in distance and over 100 feet in height, depending on the material and the setup. Once we understand your staging point and target, we can tell you quickly whether your spot is within reach.

Dry, free-flowing materials including sand, pea gravel, drain rock, crushed rock, and sandy soil. The squeeze test is the quick check: if a handful falls apart when you open your hand, we can most likely blow it.

Often, yes, and it can save you money. When suitable sand is available on site, we can frequently blow it without a pressure tank, making the placement more cost-effective than bringing in material.

Yes. We blow foundational crushed rock into position for indoor and hard-to-reach pools, delivering a clean, even base where a truck cannot dump, so construction can begin on solid, well-drained ground.

Its smooth, rounded, free-flowing shape moves beautifully through our system, allowing fast, even, precise placement. That is why it is one of the materials we pump most, from crawl spaces to shorelines.

It is moving dry, free-flowing material through hose on a controlled flow of air. Our laminar-flow system does this with precision, letting us place gravel, sand, and rock accurately at distances and in places conventional equipment cannot reach.

It reaches the tight perimeter gap evenly, places dry for good drainage, and keeps heavy equipment off your site. Those three together make for a cleaner, better-draining backfill than dumping and pushing material in.

No. A standard crawl space vent or access opening is usually enough for our hose. We do not need to enlarge the access or bring equipment inside, which keeps the work clean and the structure undisturbed.

For many structural fills, yes. Controlled density fill can seal off drainage, while dry-blown gravel keeps the voids that let water escape. Where drainage matters behind walls and footings, blown gravel is often the better choice.

By placing backfill at up to 22 yards an hour, we close trenches far faster than hand-shoveling, which shrinks the time a trench stays open and reduces the safety risk and schedule delay that come with it.

Yes, that is one of our strengths. When construction has closed in the area that needs fill, we run hose over or around the obstacles and place material in spots equipment can no longer reach.

Often, yes. When suitable sand is available on site, we can blow it into the casing without a pressure tank, which makes the backfill more cost-effective while still filling the void completely.

An empty tank underground is a hollow void that can collapse into a sinkhole over time. Filling it completely with suitable material removes that risk and is part of decommissioning a tank properly.

Yes, that is exactly our niche. We stage where material can be loaded, even out front or down the street, and run hose through the property to the pool, filling it where no truck or loader could reach.

Yes, and that is the safer approach. We stage on solid ground and reach the sinkhole through hose, so we fill the void without adding the weight of a loaded truck that could enlarge an active collapse.

An open well shaft is a safety hazard and can let surface water reach groundwater. Filling it completely with suitable material removes the hazard and protects the groundwater the shaft once accessed.

Usually, yes. We feed hose through a small access point and blow material into the void, filling an enclosed cavity completely without excavating it open, which spares the yard, slab, or roadway above.

Dry rock keeps the open voids that let water flow through it. Wet methods and controlled density fill can seal those voids, so blowing the rock in dry preserves the drainage you are actually trying to create.

We stage above, often at a driveway, and run lightweight hose down to the water's edge, blowing the gravel into place. That lets us reach shorelines hundreds of feet below without equipment descending the bank.

We stage outside the sensitive zone and run lightweight, temporary pipe and hose to the placement point, so the site sees little more than light foot traffic instead of heavy equipment tracks and compaction.

It is covering contaminated soil or landfill waste with a layer of clean material, called a cap, to isolate it. We place that clean cover evenly across the site, even on terrain that rules out heavy equipment.

We stage off the beach and run lightweight pipe and hose to the placement zone, delivering sand onto the shore without driving machinery across it, so the nourishment restores the beach rather than damaging it.

Gravel pumping is a specialized process that uses pneumatic conveying equipment to transport gravel, sand, crushed rock, and other bulk materials through a piping system. At Ensentech, we use our family-engineered technology to precisely place materials in hard-to-reach locations without extensive excavation or heavy machinery. Our equipment can transport materials up to 300 feet horizontally and over 100 feet vertically, making it ideal for residential, commercial, and environmental projects.

Absolutely! At Ensentech, we specialize in placing gravel and aggregates in confined spaces and challenging locations where traditional equipment cannot easily reach. Our services include crawl space gravel placement, foundation backfilling, swimming pool backfilling, septic tank backfill, sinkhole filling, and underground void filling. Our specialized pneumatic conveying systems can deliver materials through openings as small as four inches while minimizing disruption to surrounding structures and landscaping.

Ensentech is a third-generation, family-owned and operated business with over 30 years of experience. Our family has spent generations designing, building, and refining our own specialized pneumatic conveying equipment, with technology originally developed in the 1960s. Unlike traditional gravel placement contractors, we use custom-built, low-pressure conveying systems that provide precise material placement while reducing the need for heavy machinery, extensive site preparation, and unnecessary environmental disturbance.

Ensentech is based in Tacoma, WA, and proudly provides professional gravel pumping and aggregate placement services throughout Washington State. We work with homeowners, general contractors, builders, developers, and environmental professionals on residential, commercial, and specialty construction projects. From foundation backfilling and septic tank decommissioning to swimming pool backfilling, shoreline restoration, and environmentally sensitive material placement, we deliver dependable solutions tailored to each project's needs.