Remove Dog Urine Smell from Decomposed Granite & Gravel (Fast)

Remove Dog Urine Smell from Decomposed Granite & Gravel (Fast)

Updated September 2025 • Urine Zero

DG (decomposed granite) and gravel trap odors in fines, voids, and the base. This guide covers loose vs stabilized DG, dog-run gravel, slow-soak saturation, keeping areas damp 10–20 minutes, and when to repeat. Includes drainage fixes, coverage math, and a big FAQ.

Why DG & gravel keep smelling (even after you “clean”)

Urine binds to fines (the powdery fraction in DG) and soaks into voids and the base layer. Heat or rain releases trapped residues, so odor spikes on hot days or after storms. Perfume sprays don’t reach the source. The fix: slow-soak saturation to the same depth urine reached and keep it damp 10–20 minutes, then dry fully.

Loose vs stabilized DG — what changes

  • Loose DG / gravel: liquids move through more easily → use a slow, even soak to ~1–1.5" depth.
  • Stabilized DG (with binder): more like a “sealed” surface → expect multiple passes and benefit from light surface agitation during dwell (no heavy disturb).
  • Pea gravel dog areas: urine sits between stones and in the compacted base → soak until you see uniform dampness across stones and fines.

Find every hotspot (edges, posts, low spots)

  • Fence lines, posts, corners: common marking points — overlap treatment 12–24 in.
  • Low spots/puddling: where fines collect and odor concentrates — expand your treatment radius.
  • Transitions: along concrete/step edges and gate thresholds — treat a little beyond the visible area.

Step-by-step: remove urine odor from DG & gravel

  1. Prep. Pick up solids. Dry rake lightly to loosen crusted fines (avoid deep disturbance). Remove leaves/organic debris.
  2. Apply in evening/shade. Use a watering can or low-pressure sprayer to slow-soak the area until the top ~1–1.5" is uniformly damp (don’t blast or mist).
  3. Keep damp 10–20 minutes. Re-mist lightly if drying. On stabilized DG, lightly agitate the surface during dwell.
  4. Air-dry completely. For old/heavy hotspots, repeat in 12–24 hours.
  5. Re-set surface (optional): once dry, a light rake can re-even loose DG or gravel.

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Tools & setup — make it easy

  • Watering can or low-pressure sprayer for a controlled slow-soak (flow > mist).
  • 1-gal pump sprayer for precise coverage in dog runs and along edges.
  • Leaf rake (light pass) to break crusted fines and improve contact (avoid deep digging on stabilized DG).
  • Fans/airflow help dry time after treatment.

Coverage & severity (RTU)

Estimate how much ready-to-use you need. Increase totals for thicker aggregate beds (>2") or heavy dog traffic.

Severity RTU Rate (oz/sq ft) Typical repeats Notes
Light ~0.4 1 pass Fresh accident; good drainage
Moderate ~0.8 2 passes (12–24 hrs apart) Lingering ammonia smell; multi-dog area
Severe ~1.5 2–3 passes Old hotspots; stabilized DG; deep base

Using 10X Concentrate — mix 1:9

Mix 1 part concentrate : 9 parts water. Shake/stir the concentrate before diluting. Do not mix with other chemicals.

Final Volume (RTU) Concentrate Water
32 oz (sprayer) 3.2 oz 28.8 oz
1 gallon (pump sprayer) 12.8 oz 115.2 oz

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Drainage & surface tweaks (for long-term freshness)

  • Feather low spots: add a thin lift of fresh DG or gravel to remove puddles.
  • Edge buildup: shave humps that trap water against fences or curbs.
  • Dog-run gravel: consider a thin top-off after odor control if stones are fouled with fines.

Troubleshooting — if odor persists

  1. 24 hrs later still smells: increase depth (slower soak) and hold dwell closer to 20 min; repeat at dusk.
  2. Only smells on hot days: residues remain deeper → expand treatment radius and fully soak to the base.
  3. New area smells after treatment: wicking/migration → overlap by 12–24 in around hotspot.
  4. Stabilized DG stubborn: 2–3 passes with light surface agitation; allow full dry between passes.
  5. Drainage issues: correct low spots; odors concentrate where water sits.

FAQ — DG & Gravel

Will a hose blast or pressure washer help?

Aggressive water can move fines and create ruts without fixing odor. Use a slow, controlled soak to reach depth, keep damp 10–20 minutes, then dry.

Can I mix Urine Zero with vinegar or bleach?

No. Mix 10X with water only at 1:9. Mixing with other chemicals can reduce effectiveness and isn’t recommended.

Is it safe for plants or grass nearby?

Use as directed and avoid overspray/runoff into planting beds. Treat at dusk; keep the soak controlled and within the DG/gravel zone.

How many treatments will I need?

Fresh areas often resolve in one pass; old hotspots, multi-dog areas, or stabilized DG typically need 2–3 passes spaced 12–24 hours apart.

Will this make the path muddy or soft?

Applied correctly (slow soak; no over-flooding), it should not. Allow full dry between passes; light rake after drying can re-even loose DG/gravel.