Which is better for treating a chicken coop?

Harris, mainly because of the 10.5 lb bag and the included duster. A coop needs volume and even dusting, and the duster makes that easier. Orku works too but you would supply your own applicator.

Is the Orku powder safer to breathe?

Orku states less than 1% crystalline silica, and Harris does not state a figure. Neither is a reason to skip a dust mask. Wear an N95 or similar when applying any DE, and keep animals out of the dust cloud.

Orku, at approximately 20 UM. Harris does not publish a particle size. Finer powder spreads more evenly and clings better, which matters for mite and flea dusting.

Is Harris worth the extra cost?

Compare price per pound, not bag price. The Harris bag is roughly ten times the volume of a small Orku pouch, so a higher sticker price can still be cheaper per pound. Check both at the stores listed above.

Can I use either in animal feed?

Both are food grade and sold for feed use as an anti-caking agent. Follow the label rate, and check with your vet before using DE as a de-wormer, since the evidence for that is weak.

Harris states no expiration date, and DE is a mineral that does not spoil. Keep either bag sealed and dry, since moisture is the only real risk.

Harris Food Grade Diatomaceous Earth with Powder Duster vs Orku Fine Diatomaceous Earth - Food Grade FCC Fossil Shell Flour Powder

Both are 100% freshwater food-grade diatomaceous earth with no additives, so the real choice is bag size and applicator versus a finer, lower-silica mill. Harris gives you 10.5 lb plus a powder duster in one bag, which suits barns, coops and multi-animal households. Orku is milled to about 20 UM with under 1% crystalline silica and FCC-consistent purity, which suits people who want a fine, easy-dispersing dust for smaller jobs. Compare the current per-pound price at each store before deciding, since the Harris bag is far larger.

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