Zeolite, coated sand or plain silica infill for a dog yard?

Infill is the layer of sand or granules poured between the turf fibers, and it does three jobs: it weighs the turf down so it lies flat, it supports the fibers so they stand up under foot traffic, and it holds whatever lands on the surface, including urine, until it either drains through or gets treated. Which material makes up that layer matters most in a yard dogs actually use.

Rounded silica sand is the standard infill on turf built for a people-only yard. It is inert: it does not absorb ammonia or slow it down, so urine drains straight through to the backing and the bacteria there get to work as usual. For a yard without pets it is the right, cheaper choice. In a dog yard, it means the odor step at cleaning time is doing all the work with no help from the infill itself.

Zeolite is a porous mineral that adsorbs ammonia into its structure rather than letting it evaporate back through the fibers. In a pet zone it measurably cuts the smell between cleanings, though it does not eliminate the need for enzyme treatment, since it manages ammonia rather than digesting the urea residue itself. It is heavier than plain sand and, in our experience, holds up well over several years before it needs topping up.

Coated sand is silica sand with an antimicrobial or odor-neutralizing coating applied to each grain. It is lighter than zeolite and usually the lower-cost of the two odor-control options, and it works by slowing bacterial growth on the grain surface rather than adsorbing ammonia the way zeolite does. The coating wears over years of use and sun exposure, so it is the infill most likely to need topping up on a set schedule rather than an as-needed one.

Infill depth for a healthy pet zone depends on the turf's pile height, and a pet zone of any real size holds a meaningful amount of infill material at a normal depth. That is the quantity the $0.75 to $1.50 a square foot installed price is covering: material, labor to extract the old infill, and labor to install and level the new material evenly. A larger pet zone costs proportionally more simply because it holds more material, not because the per-square-foot rate changes with size. Depth matters as much as material choice: even the best odor-control infill installed too thin drains faster than bacteria can be managed, so we measure depth as part of any infill quote rather than pricing blind off square footage alone. A yard that has never had its infill measured is more likely to be running thin than running the wrong material, which is worth checking before spending on an upgrade that will not fix a depth problem.

If the current infill is plain sand and the yard has one dog with a normal routine of pickup and rinsing, switching is a nice-to-have rather than a necessity, since a quarterly or twice-yearly enzyme treatment does most of the work either way. For two or more dogs, a daily-potty yard, or a yard that has struggled with odor even after treatment, an odor-control infill in the pet zone earns its extra cost by cutting how much ammonia builds up between visits.

Switching infill means the old material in that zone comes out and new material goes in, priced at $0.75 to $1.50 per square foot depending on the infill chosen, on top of the visit itself. We measure the pet zone and tell you what it would cost before doing anything. See our infill replacement cost breakdown for the full numbers, or the infill service page for what a top-up alone costs.