反渗透（RO）是一种水净化过程，它通过压力迫使水通过半透膜，去除高达 95-99% 的溶解盐、矿物质、氯、氯胺和其他污染物。在水培法中，RO 水被用作清洁基线——基本上是 EC 接近于零的无矿物质水——允许种植者从头开始构建精确控制的营养液，而不会受到不可预测的自来水化学成分的干扰。
关键事实
- Produces near-pure water with EC close to 0.0 mS/cm and pH typically 6.0–7.0
- Removes chlorine, chloramines, heavy metals, and dissolved salts from tap water
- RO water has zero buffering capacity — pH swings are more sudden and harder to stabilise
- Cal-Mag supplementation is essential when using RO water (no baseline Ca/Mg)
- RO systems waste 3–4 litres of water for every 1 litre of purified water produced
- Essential for growers in areas with hard water (EC above 0.4) or high sodium content