Case Studies

Springhill Water Treatment Services

4th December2008

Proquip

Igon used to clean out blocked pump ‘down the hole’.

A borehole supply in West Yorkshire feeding directly into 14 properties was reported not delivering sufficient flow or pressure. After checking for obvious causes such as leaking under ground pipes, holed riser pipe etc. it was concluded that either the pump intakes were blocked or the impellers clogged with iron.

The pump was sited at 60 metres on 1¼ galvanised steel pipe and so lifting the unit would have been a lengthy, time consuming operation.

It was decided to use Igon down the hole in an attempt to remove the blockage without having to lift the pump.

Using the dosing information provided 6kg of Igon was dissolved into some water, poured down the borehole and then re-circulated for a couple of hours. Within 10-15 minutes a significant improvement in the flow from the borehole was noted. After a full two hours no further improvement was seen and so the cleaning process was considered to be complete.

The original closed valve pressure was 1.2bar and the maximum flow just 9litres/min.
On completion of the clean the closed valve pressure was in excess of 6.0 bar and a flow of 55 litres per minute was achieved.

The spent Igon was pumped from the borehole into a tank and removed from site for disposal. The borehole was then allowed to discharge to drain for a few hours to ensure all the Igon had been removed prior to putting the system back into commission.

The use of Igon saved a considerable amount of down- time to the water supply, this being particularly important because one of the residents used a home dialysis machine which required a water supply for it to function. The Igon not only cleaned the pump intakes and impellers but will also have removed iron from the casing screens and pump riser pipe so a more complete cleaning will have been achieved.

Igon used to increase a borehole yield.

A borehole supply in West Yorkshire feeding into a single dwelling was having difficulty providing an adequate yield of water to the house, particularly when there was an increased occupancy due to guests staying for any length of time.

Igon was mixed up with water, added to the borehole and then re-circulated for short periods of time over 48 hours.

On completion of the cleaning the spent Igon was pumped into a tank and removed from site for safe disposal. The borehole was then pumped to drain a number of times over the next few days to remove all traces of the Igon before the system was put back into commission.

Dip tests taken before and after the Igon cleaning indicated an increase in yield from the well in the region of 36%. This increase was considered

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