Lawn Establishment Over Former Pool Base: Removing Alkaline Sand-Lime Mix Before Planting

The sand-lime (likely mason's sand + hydrated lime) pool base creates a high-pH, cementitious layer that repels water and prevents root penetration. Grass will not establish in this material—it must be removed.

Why the Pool Base Prevents Grass Growth

• Extreme alkalinity: pH 10–12 from lime; most grasses need pH 6.0–7.0.
• Cementation: Lime + sand + moisture = weak concrete; roots cannot penetrate.
• Zero cation exchange: No nutrient holding capacity; fertilizer leaches instantly.
• Hydrophobic when dry: Water beads off; rewetting difficult.

Required Remediation

1. Excavate entire pool area: Remove all sand-lime mix to native soil (typically 6–12 inches deep).
2. Test native soil: pH, texture, drainage. Amend per results.
3. Import quality topsoil: 8–12 inches of screened loam/compost blend (60/20/20 sand/compost/loam).
4. Blend interface: Rototill 2–3 inches of new soil into native subsoil to prevent layering.
5. Grade for drainage: 1–2% slope away from structures.
6. Install irrigation: Before final grading.
7. Sod or seed: Match grass to zip code 70168 (New Orleans area → St. Augustine, Centipede, or Zoysia).

Grass Recommendations for 70168 (New Orleans Metro)

Cost-Saving Tip

The excavated sand-lime mix makes excellent base for pavers, pathways, or drainage projects—sell or reuse on-site rather than paying disposal fees.

Don't attempt to "fix" the pool base in place. Complete removal and replacement with viable soil is the only path to a successful lawn. The 70168 climate supports beautiful warm-season grasses—give them the root zone they deserve.