Removing sand from a borehole requires a multifaceted approach depending on the amount of sand, the borehole's depth, and available equipment. There's no single solution, but several methods can effectively address this issue.
Methods for Removing Sand from a Borehole
Several techniques can be employed, ranging from simple air blowing to more sophisticated filtration systems.
1. Air Blowing
For smaller amounts of sand, blowing air into the borehole can be effective. This method is mentioned in several sources.
- Procedure: Use an air compressor to force air into the borehole, carrying the sand particles to the surface with water and moisture. This may require a substantial amount of air pressure. Continue blowing until no more sand is expelled. One source suggests this should remove at least a truckload of sand. (Reference: "There is a need to drill the bore well and blow out the silica rich sand like particles... Blow out a maximum of about a truck load of the particles or more and keep on blowing air until there is no more sand coming out.").
2. Water Pumping
If the sand is submerged in water, a pump can be used to remove both water and sediment.
- Procedure: A submersible pump is suitable for deeper boreholes. Pumping water repeatedly can remove significant amounts of sand over time. (Reference: "If under water, use a water pump. It will remove quite a bit of sediment.")
3. Suction Methods
Suction techniques, similar to vacuuming, can be implemented for shallower boreholes.
- Procedure: A homemade air vacuum using PVC pipe and an air hose can be constructed for shallower wells. This method may require adaptations depending on the borehole's depth and diameter. (Reference: "You can make an air vacuum with a 30' piece of 1 1/4" PVC pipe and a 1/4" air hose with a couple of elbows at the bottom.") For deeper applications, a more powerful vacuum system might be necessary.
4. Specialized Filtration Systems
For well water that consistently contains sand, installing a filtration system is crucial for long-term solutions.
- Types: Several filter types address sand removal, including centrifugal sand separators, sediment filter cartridge systems, and sediment backwash filtration systems. (Reference: "Find three popular techniques like centrifugal sand separators, sediment filter cartridge systems and sediment backwash filtration systems to remove sand...") These systems prevent sand from entering the water supply.
Choosing the Right Method
The best method depends on several factors:
- Amount of sand: For small amounts, air blowing or suction might suffice. Larger amounts often require pumping or filtration.
- Borehole depth: Deeper boreholes usually require pumping or specialized equipment.
- Available equipment: The choice of method depends on available tools and resources.
