The Solinst 410 mk4 peristaltic pump provides the simplest solution for sampling ground water where the depth to water is less than 8 m. Flow rates as low as 40mL/min up to 900mL/min are possible when used with 3/8" silicone tubing in the pump head and 1/4" down well tubing. Supplied with SLA battery, charger and Hanna Instruments Flow Cell.