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>Your experience with the tank is completely normal. It >is designed to be used with what I call a "drinking >water well" which is a low volume, high pressure well. >The tank is supposed to reduce wear on the pump by >storing water so that the pump doesn't come on every >time a toilet is flushed. It would take a couple of >toilet flushes or a long shower to use up the water in >the tank, then the pump comes on and the pressure is >whatever the pump can produce until the tank is full. > >What you want is the opposite, high volume and most >sprinkler heads are designed for 30psi, so lower >pressure and you don't need a tank for that. > >Your problem is volume and not enough of it for a >sustained pull. You probably need to go deeper or you >need a bigger pump. > >When people say that 25 feet is the limit for a pump, >what they mean (and never say) is the "draw down >level" can't go under 25 feet. That's the level when >the pump is pulling full blast. > >So let's say your well is 50 feet deep. The standing >water level (measured with a string and sinker) is 15 >feet, but when you hook up your pump and turn it on, >it drops to 22 feet and stays there -- all is good, >though you won't have as much pressure as if the water >was coming from a pond. But if the water drops to less >than 25 feet, the water will stop. > >I think what you need to do first find something >called a "pump curve" for your pump. One exists, but >it may be hard to track it down. Most pumps purchased >in a Big Box Store don't come with one. The curve is >just a chart that shows that pulling from x feet deep, >the pump SHOULD produce y gallons of water per minute. >This will tell you if the pump is too small. But just >putting a larger pump on there may not fix your >problem if the well drawdown level goes down too far. > >So look in the instructions for a diagram like that. >If it isn't there, look at the website for the company >that built the pump. Not there? Call the pump >manufacturer and ask for one. > >Some people buy their pumps at "pump stores" and pay >extra for a better built pump and they will usually >get good advice there and the advice is coming from >that curve. We have them around here in rural areas.

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