Artificial Turf Infill Types: Which One to Choose

Infill is the weight and structure of a turf lawn. Spread across the surface and brushed down between the blades, it holds the turf flat against wind and traffic, keeps the fibers standing upright so the lawn looks full, and adds ballast so the whole system stays put without lifting.

It also shapes how the lawn performs. Infill helps water drain straight through instead of pooling, it influences how hot the surface gets in direct sun, and for pets it is the layer that has to shed liquid and resist odor. Choosing the wrong infill, or skipping it, is a common reason a turf lawn matts down, smells, or feels harsh underfoot.

The amount you need is set by a spread rate per square foot, which varies with the turf pile height and how the lawn is used. Once you know which infill you want, the material calculator turns your area and rate into pounds and whole bags.

Rounded silica sand is the workhorse infill and the default for most lawns. It is inexpensive, widely stocked, drains well, and does the core job of weighing the turf down and keeping the blades upright. For a plain landscape lawn it is usually all you need, spread at a modest rate per square foot.

Coated silica sand is the same grain with an added coating — often acrylic or an antimicrobial layer. The coating helps the grains resist clumping, drain a little better, and, in antimicrobial versions, discourage the bacteria that cause pet odor. It costs more than plain sand and is a sensible upgrade for pet areas or anywhere that stays damp.

Both are heavy, stable, and non-flammable, which is part of why sand is the base layer under almost every other infill. If you are unsure, plain silica sand for a lawn and a coated or antimicrobial sand for pets covers most yards.

Crumb rubber, made from recycled tires, adds cushioning and bounce, which is why it is common on sports fields and play areas where fall protection matters. It is durable and cheap, but it holds heat, can carry an odor in hot sun, and its recycled-tire origin puts some homeowners off for a residential lawn.

TPE, or thermoplastic elastomer, is an engineered alternative that gives similar cushioning to crumb rubber without the recycled-tire concerns. It runs cooler and is cleaner in feel, but it costs more. It suits playgrounds and family lawns where softness matters and budget allows.

Zeolite is a natural mineral whose porous grains trap ammonia, which is the source of pet-urine odor. Used with or instead of sand in a pet area, it markedly reduces smell between rinses. It is a targeted, pet-first infill rather than a general-purpose one, and it is usually paired with a sand base.

Organic infills such as ground walnut shell or cork are the plant-based option, chosen by people who want to avoid sand and rubber. They are lighter and run cooler than rubber, but they can break down, hold moisture, and need more attention over time, so they suit gardeners who accept a little upkeep for a natural material.

Matching infill to use is straightforward once you know the yard. A general lawn does well on plain silica sand. A pet run is best on an antimicrobial coated sand or a zeolite blend that fights odor and sheds liquid. A playground or sports surface wants a cushioning infill — crumb rubber for budget and durability, or TPE for a cooler, cleaner feel.

Whatever you choose, the quantity follows the same math: area times a spread rate, rounded up to whole bags. Set your rate in the material calculator to see the pounds and bag count for your lawn, then confirm the grade and coverage with your supplier.