You get more water from a 5" PVC (plastic) casing than from a 4" steel casing.
Both 5" PVC casing and 4" steel casing wells use the same pumps - the primary factor in how much water can be pumped. In fact, a 4" steel casing well often out-produces a 5"PVC casing well because of the advantages of cable tool drilling. The reason plastic casings are 5" is that the State of Michigan requires it. Why? Because PVC can and has collapsed and become egg-shaped form such things as underground boulders pushing against the plastic.
Plastic is as good as steel.
Steel is clearly superior to PVC in every respect, because PVC can crack and collapse. It can lose its shape from heat generated while its sealing material cures. It can be cut during well construction. In short, steel has none of PVC's shortcomings.
Filling the gap between the hole and casing with mud slurry sealed the older rotary-drilled wells.
Mud is soft, wet earth which allows contaminated water to pass through it. Mud slurry was never a tight seal despite what some rotary drillers have said. That's why that ineffective practice was outlawed in 1994.
Cable tool wells can't be sealed.
Older cable tool wells sealed naturally because the bit was smaller than the outside diameter of the steel casing (e.g. a 4" bit used with 4.5" outside diameter pipe). The driving action of the cable tool wedged the pipe into the smaller hole which sealed the well.
Then in 1983, Mr. Leonard developed a dry granular grouting process for sealing wells. As the granules are pushed along side the casing by the pipe couplings, they become moist ... swell to ten times their original size ... and create a seal so strong that the steel casing wont rust. In fact, if his steel casing ever rusts through, Mr. Leonard will replace your well for free.
The sealing method is so effective that when the State of Michigan investigated it ... laws were rewritten to require that all driven casings started with an undersized hole be sealed with his grouting process. But even that wasn't quite good enough for Mr. Leonard.
You always get a good seal by pumping a true sealant between the 8" or larger rotary-drilled hole and 5" PVC pipe for the full length of the casing.
This can be a disastrous sealing method because cave-ins can happen before the sealant is pumped into place. If that happens there's no way to repair it. It must be pulled and re-drilled. Otherwise, water can leak from zone to zone and allow dangerous polluted water to leak into good water zones.
Wells using PVC casing won't be hit by lightning.
Regardless of well casing material, most lightning damage to pumps happens when lightning strikes power lines. But unlike steel, a PVC well casing can melt from the heat of lightning - thus destroying the entire well.
A 4" pump will corrode to the sides of a 4" steel pipe, which prevents it from being pulled fro repair or replacement.
It's rare that a 4" pump corrodes to its well casing. Even then, Mr. Leonard has never lost a well to pump and well casing corrosion. That's why he guarantees that he can pull the pump he installs for you ... or drill you a new well for free!
Plus he now has smaller pumps - up to 3/4 H.P. - which fit into 3" wells. Used in a 4" well, those pumps have plenty of clearance.
You don't get rust in the water with PVC casing.
Rust does not come from the casing. It comes from the minerals in the earth that the water flows through as can be seen in flowing streams or hillside springs.