SmartGro High-Pressure PumpsSmartGro High Pressure Pumps SmartGro offer two submersible high pressure pumps designed to circulate large quantities of water and nutrient throughout your grow system consistently and with ease. The smaller SmartGro High Pressure Pump moves up to 3500 litres of water per hour, while its larger counterpart moves up to 7000 litres per hour. These pumps are thoroughly tested in saltwater conditions and have proven to be suitable for use in both salt