Easy to use, economical and flexible system for automatic fertilizing. Unlike similar systems, you can see the amount of fertilizer solution as it is used. Commercial grade components, appropriate for residential or commercial growers and landscapers. Tank capacity is approximately .75 Gal. Attaches to hose bib; includes hose bib adapter, tubing, tubing valves and tank. Minimum flow 2.5 GPM or 120 GPH. However, if your drip system uses less than 120 GPH, the EZ-FLO comes with 3 different flow discs that can be inserted into the hose bib adaptor to slow down the flow. The white disc is for 60-120 GPH, the black disc is for 30-60 GPH and the red disc is for rates as low as 7.5-30 GPH. You can calculate your water flow by multiplying the number of drip emitters on your system by their gallons per hour flow rate. Or for drip tape, the flow rate per 100 feet of drip tape. Injection rate is adjustable, between a fast setting of 1:100 and a slow setting of 1:1000. Water volume to empty tank is between 75 gal for the fast setting to 750 gal for the slow setting. Not designed for use under constant pressure.