BOREHOLE DRILLING
BOREHOLE CLEANING
EMERGENCY PUMP REPAIRS SUPPLY AND INSTALLATION
PUMP SUPPLY AND MAINTENANCE
HYDRO-GEOLOGY SERVICES
WATER LOCATION
WATER SAMPLING REPORTS
WATER FILTRATION
REFURBISHMENT OF EXISTING BOREHOLES
DE-COMISSIONING OF EXISTING BOREHOLES
WATER WELL CLEANSING AND MAINTENANCE SERVICE
Finance for boreholes available please call for details
BOREHOLE DRILLING - Construction of a Water Well
To procure a good quality, natural water supply it becomes necessary to drill to depths of at least 200 feet into the water bearing rock where the bacteria present in surface water, has been well filtered out, however at these depths the water will have collected various minerals often beneficial to our health although in high quantities needing to be filtered before consumption. Particular regions from where the water is drawn can often dictate its mineral content.
The newly constructed well is then lined, cased to the full depth and grouted at the upper levels to ensure that the water is drawn only from the lower depths of the well.
A submersible borehole pump, tailored to individual requirements is then lowered to yield the exact amount of water requested.
Head works at each well is tailored to suit the individual as also the size of surge tank to suit each commission.
All materials used are non toxic, corrosion free and will not impair the water quality.WATER WELL CLEANSING AND MAINTENANCE SERVICE
WHY SHOULD THE NEED ARISE TO REGULARLY
CLEANSE AND MAINTAIN YOUR WATER SUPPLY?
The second most important consideration after the proper construction of your well should be an ongoing cleansing and maintenance practice to ensure that your well consistently gives you the same flow rate as from initial construction and a clean potable water supply. Depending upon the mineral content of the water yielded this service becomes necessary between every one to five years and the water analysis report will determine this. This cost is considerably less than annual mains water bills and ensures that your well is kept in ‘tip top’ condition.
Often this simple practice eliminates the need for costly unnecessary filtration equipment which some companies may add years after construction to counteract the effects of mineral build-up in a well that has been left uncleansed over a period of time to create contamination of the well and water.
IRON AND MANGANESE IN GROUNDWATER
Many Boreholes the world over are contaminated with Iron Oxide deposits in one form or another either from conversion of dissolved iron salts from the water or by the action of certain naturally occurring bacteria which thrive in an iron-rich environment.
The contamination will take the form of rust-red deposits which will gradually block the pump impellers, waterways, any rigid piping within the well system and also downstream system, causing loss of flow due to reduction in diameter of bore and increased surface friction. The tell-tale signs will be diminishing flow from the well suggesting that iron fouling could be present.
A brown/black coloration to the water will indicate the presence of manganese oxide contamination which is similar to iron oxide contamination in most respects - and will generally occur in conjunction with it.
SURFACE SYMPTOMS
If water from the pump appears to be crystal clear yet takes on a brown tinge after standing for a while it contains dissolved ferrous salts which are oxidising to the insoluble ferric form. With less oxygen available below ground this process will be very gradual at the level of the pump but a hard, rusty, layer will slowly build on hard surfaces and start to choke the waterways.
Should the water be rusty and cloudy looking on start-up and have an unpleasant smell there will be Iron Related Bacteria at work in the depths. These grow as an orange slime while also oxidising the ferrous salts into ferric solids which will, again, cause acute blockage of the water passages.
Each borehole is, of course, different but many “iron affected” wells will suffer both direct oxidation and bacteriological contamination to some degree.
Our Chemclean Maintenance service has been formulated to remedy this problem.
CHEMCLEAN : Description
Chemclean is introduced into the well in liquid form containing a powerful, naturally occurring chemical, which will combine with the Iron Oxide deposits in the well to form a solution which can be pumped clean away from the borehole carrying with it all bacteria and foul deposits. Chemclean will not however, react with or damage any metallic or man-made material generally used in borehole pumps or pumping systems.
SETTING UP THE SITE
Cleaning the borehole can take up to 48 hours depending on the severity of contamination so an appropriate time slot must be identified beforehand.
The pump will be turned off and isolated electrically before carrying out any maintenance to the system, however there is no need to remove the pump from the well.
Provision will be made to re-circulate the water from the wellhead back into the top of the borehole during cleansing rather than discharging by the normal route. Any of the normal pipe run incorporated in this circuit will, of course, benefit from the cleansing action of the solution.
At the primary rinsing stage the reaction product will be flushed from the borehole so an effluent tank shall be provided to receive this, capable of taking 5 or 6 times the water capacity of the well.
CLEANING THE BOREHOLE WITH CHEMCLEAN
Chemclean shall be fed directly into the bore, as a “slurry”, and should be allowed half an hour to dissolve as it settles through the water. The pump shall then be reconnected and run for at least an hour re-circulating the resulting solution through the wellhead and back into the borehole to ensure all surfaces are treated. The pump can then be turned off and the solution left to act for up to 48 hours – alternately, continued re-circulation will speed the cleansing action significantly.
RINSING
Primary Rinse: After soaking for 24/48 hours (by which time reaction will be complete) the pipe-work shall be reconfigured to divert most of the water to the effluent tank and the pump shall be re-started. The water shall be flushed until all the Chemclean solution – by now a green turbid liquid – has been flushed away and the water runs clear.
Secondary Rinse: Once the water runs clear it is then diverted to waste ground or other approved clean water disposal facility and continued to run for two hours.
NEUTRALIZATION
Any residual acidity will be treated with a Neutraliser to ensure that water is restored to its pure clean state. Neither Chemclean nor its reaction products will remain within the borehole system in measurable quantities further to neutralization. Testing is carried out to show the level of reaction product remaining in the water after treatment – specifically during the neutralization phase.
CONTINUED MAINTENANCE AFTER CLEANING
Recurrence of Contamination Chemclean is not a ‘Miracle Cure’ and the contamination will reappear in the borehole as it is an entirely natural process. Experience will dictate the frequency of treatment necessary to keep the problem in check with a minimum of down-time.
Riser Porosity Steel risers (and other downstream pipe-work) will suffer from corrosion over time and may rust through entirely to cause minor leakage holes – removal of the surrounding oxide layers with Chemclean will reveal the true severity of the problem, though can increase leakage. Unless the bore is sufficiently large for a CCTV survey the only way to check for this problem is to lift the riser for inspection. Care should be taken as severe corrosion could have weakened the steel leading to a danger of losing the pump in the bore.
CLEANING OTHER SYSTEMS AND COMPONENTS
WITH CHEMCLEAN
Chemclean can be used to clean pipe-work or other items such as pump or valve components. Each pipe-work system will, of course, be different but a sequence similar to above – filling, 48 hour soak or re-circulation if possible and rinse – should remove Iron Oxide deposits as before. Contamination of smaller components can be treated again in the same way as described.