Our preferred borehole casing is class 9 ( pressured class) drip tech PVC.,To keep loose sand and gravel from collapsing into the borehole,it is necessary to use borehole casing . borehole casing support s the borehole walls while allowing water to enter.this mean s that the casing must be strong enough to withstand underground pressure.,This is… Ona why we prefer class 9 casings.
$1,200