Hydromechanical Regeneration

Low Pressure Cleaning

The highly efficient hydromechanical low pressure cleaning technology is mainly used for specific filter frame material, particularly stoneware and OBO filters. Applied after the pressurewave impulse method, this technology is excellent in removing efficiency-reducing sediments in the annulus. Additionally, the low pressure cleaning tool is applicable to any water well type.

The central part of this technology is the swivel, diverting high pressure water jets through the filter into the surrounding filter gravel. The reflux separates the deposit from the tube and the gravel and takes it into the Filter tube. Continued pumping via submerged pump, exports the dissolved deposit per operation section. Each operating section is monitored by the current/standard methods of sediment acquisition adapted by the DVGW/ W130 certification.

The core element, the low pressure swivel, equipped with a specific packer is connected with the submerged pump and the standpipe. All components are customized to be wellspecific. The regeneration tool is placed in the well. The sectioned filter treatment begins with closing the outlet and starting the pump.

High Pressure Cleaning

The high pressure cleaning method is used for light and midhardened deposits. This high pressure tool is applicable for any well material and state, horizontally and vertically.

The high pressure cleaning tool is a rotary swivel which points a water jet at the interior well wall whilst moving up and/or down.

The water pressure and nozzle alignment are adjustable for any well type. The tool movement is specifically adjusted to ensure a complete well cleaning. The dissolved deposits are removed by a submerged pump until the exitcriteria is fulfilled. The process is monitored by the DVGW/ W13-Certification. By adding an accessory unit, this tool can also be used as a highpressure impulse treatment.


The hydropuls® procedure is a high pressure impulse treatment. Originally used for seismic exploration and oil extraction, the Berliner Wasserbetriebe use compressed Nitrogen for well regeneration since 1954. In the early 1990´s, Russian engineers modified the impulse techniques for well regeneration methods. The hydopuls® procedure is based on these modifications. The principle on which the hydropuls® works can be described as follows: impulse intervals are generated through an abrupt expansion of a highly compressed liquid or gas inside a moving impulse generator. Valves inside the generator ensure short term switching times and thereby a high impulse frequency similar to the Shockblasting® procedure. A specific device enables a direct pump out of dissolved deposits directly through the generator.

This method is versatility applicable for any well material and type. The main differences to the Shockblasting® method is the impulse speed, the hydropuls® impulse is considerably slower and adjustable within a certain range. Thus, the impulse is more “gentle” and applicable for more brittle materials such as PVC, HDPE, OBO and stoneware wells. However, the hydropuls® method is highly adjustable and can be well specific individualized more “intense” or “gentle”.


The hydromechanical well regeneration methods can be separated into two groups:

  • Methods with continued mechanical or fluid mechanical impact, e.g. brushing, pistons, intensive extraction, high-/ low pressure cleaning, CO2-procedure)
  • Methods with discontinued/ impulse-like impact (e.g. Shockblasting®, Inlineblasting®, fluidpuls® and hydropuls®

In 1990, the Berliner Wasserbetriebe started with its own invented impulse technologies, even using explosive material for well regenerations. Experience and results from field tests revealed the suitable amount needed, and Shockblasting® was developed to series maturity in 1991. Due to several years of national and international experience behind us, pigadi is using Shockblasting® successfully for well regenerations. Distinctive for the method of Shockblasting® are:

  • The resilient, evenly spread primary impulse over the whole filter which leads to a hydromechanical dissolution of deposits and
  • The following secondary impulse (blowhole cycle conversion of the explosives) which remove the deposits and deep clean the well.
  • A wide range of possible application (any well type)
  • A highly effective, simultaneous, and evenly spread impulse
  • The treatment enables the cracking of old mineralized well coatings
  • Fast and economic
  • Environmentally sustainable due to the lack of of foreign matter.
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