Growmax Pro Grow - 2000 litres / hour - 2-Stage Water FilterGrowmax Water Filters Pure Water for a Pure End Product! Growmax filtering systems efficiently remove a wide range of chemicals from your tap water, making them ideal for growing medicinal grade herbs. Ensuring that unwanted chemicals are not added to your nutrient regime is essential. While contaminants in tap water are typically found in low concentrations, they can accumulate in the substrate over time and cause problems. To achieve a truly clean