Troubleshooting
Poor root growth in dense sand.
Improve aeration with pumice, rice hulls, or coco coir and avoid overwatering.
High runoff EC.
Flush the medium and improve leaching fraction or drainage.
Sand
A dense mineral growing medium that provides structure and drainage in hydroponic-adjacent systems, usually blended with other media rather than used alone.
Maintenance
- Avoid fine sand that compacts and excludes oxygen.
- Flush periodically to prevent salt accumulation.
- Sterilize or replace if disease problems occur.
Make It Yourself
- Use clean, washed horticultural or coarse sand rather than fine beach or contaminated construction sand.
- Rinse thoroughly until runoff is clear.
- Blend with coco coir, peat moss, pumice, or other media to balance water retention and aeration.
- Use in deep containers or beds where weight and drainage are manageable.
Cost
- 5 - 40 NZD
Specifications
- Water retention: low to medium depending on particle size
- Aeration: medium when coarse, low when fine or compacted
- pH tendency: varies by source
- Reusable potential: high if cleaned
Cultivars
Methods
| Method | Compatibility | Notes |
|---|---|---|
| Drip Irrigation | good | |
| Deep media bed | good | |
| Wick | poor |
Issues
| Issue | Description | Remedy |
|---|---|---|
| Compaction | Fine sand can compact and reduce oxygen around roots. | Use coarse washed sand and blend with larger-pore materials. |
| Weight | Sand is heavy and can strain benches, towers, or containers. | Use only where structural support is adequate or blend with lighter media. |
Advantages
- Cheap and widely available
- Good structural support
- Reusable if cleaned
- Useful for root crops in blends
Disadvantages
- Heavy
- Can compact
- Quality and pH vary by source
- Poor standalone aeration if too fine