23184 Fraser Highway, Langley  BC V2Z 2V1
604-534-1115   www.edspumps.com

April Newsletter April  2011
In This Issue
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Flow test






Wells draw water from aquifers, which are zones of saturated permeable soil or rock. Some types of soil make for good aquifers, such as gravel and  course sands that can support high water pumping rates, while other types of soil make for poor aquifers, such as silty sand and clay that cannot support high water pumping rates.


Wells can run dry for the following reasons:

  • The pumping rate is higher than the groundwater recharge rate.
  • The water table (level of saturated water in the soil) has dropped to below the pump suction or inlet.
  • The well screen has become plugged by fine sand, chemical precipitation, bacterial fouling or corrosion.
  • If a well vent becomes blocked, a negative pressure may occur (in the well) during draw down and reduce or stop the pump from drawing water.

A Flow Test can help determine if a well can produce a sufficient quantity of water.

  • A pumping test is a practical, reliable method of estimating well performance, well yield, the zone of influence of the well and aquifer characteristics (e.g. the aquifer's ability to store and transmit water, anisotropy, aquifer extent, presence of boundary conditions and possible hydraulic connection to surface water).
  • A pumping test consists of pumping a well, usually at a constant rate, and measuring the change in water level draw down in the pumped well and any nearby wells (observation wells) or surface water bodies during and after pumping (see Figure 1).
  •  Pumping tests can last from hours to days or even weeks in duration, depending on the purpose of the pumping test, but traditional domestic pumping test durations are normally 4 to 72 hours.


 Click here read the Ministry of BC Brochure  Conducting Well  Pumping Tests  



Save time and Money
Maintain your Pump & Water Treatment

Regular maintenance on your pump and water treatment equipment can save you time and money. There is nothing quite as frustrating as having that long anticipated get together with friends and family only to have no water or undrinkable water on  the day of the event. Regular maintenance is a very good safe guard against malfunctioning equipment.

  • Failure to add the appropriate regenerant to your filter may lead to compacted media which will need to be replaced prematurely.
  • Filter Valves should be serviced once a year to clean the injectors and samples of the raw and treated water should be analyzed to detect any changes in the raw water or water that may not be treated properly with the filter.
  • Cartridge filters should be changed regularly. Usually each quarter or when there is a drop in the water pressure.  
  • Reverse Osmosis filters should be changed every six months and 2 to 3 years for the membrane. 
  • Pumps should be maintained on a yearly basis to detect any wear and tear on the pump.  
  • Arsenic levels should be tested regularly depending on the type of filtration you have.  


Contact one of our qualified Water Treatment Specialists for more information on how to maintain your pumps & water treatment system. 604-534-1115 



How do I size a pressure tank?


Dave Mellis


The functions of a pressure tank are to:

(1) protect and prolong the life of the pump by preventing rapid cycling of the pump motor;

(2) provide water under pressure for delivery between pump cycles; and

(3) provide additional water storage under pressure to assist the pump in meeting the total demands of a system if the pump or well is incapable of supplying the required capacity.

Selecting a Pressure Tank

When selecting a pressure tank, certain information must be known:

(1) system demand;

(2) pump capacity; and

(3) well capacity.


The system demand is a function of water usage and location, expressed as gallon(s) per minute (gpm) and pound(s) per square inch gauge (psig), respectively. Usage or flow (gpm) can be determined using one of several methods (refer to Table IV.1.1 for typical demands):


a) The fixture method determines the system demand by totaling the number of fixtures in the home, including outside hose bibs, and multiplying this number by 1 gallon per minute (gpm). For example, 10 fixtures x 1 gpm = 10 gpm.


b) The peak demand method determines system demand considering that more than one fixture will be in use under peak demand. The number of fixtures being used at the same time is determined and multiplied by 3 gpm. For example, 4 fixtures x 3 gpm = 12 gpm.


c) An alternate method determines system demand by calculating the number of bathrooms (half baths are considered as 1) and multiplying by 4 gpm. For a home with 2 � bathrooms, multiply 3 x 4 gpm = 12 gpm.

Use the largest system demand determined by the above methods.

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Did you know?


 spoon of waterjug of water  

Water Facts


If all the world's water were fit into a gallon jug, the fresh water available for us to use would equal only about one tablespoon.


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Monthly Laugh

Boy with Bucket


One day, Little Johnny's grandmother sent him to the water hole to get some water for cooking dinner.
As he was dipping the bucket in, he saw two big eyes looking back at him. He dropped the bucket and ran back to grandma's house as fast as he could.
"Where's my bucket and my water?" She asked.
"I can't get any water from that water hole, there's a mean ol' alligator down there!"
"Now don't you mind that ol' alligator, Johnny. He's been there for years,
And he's never hurt no one. Why, he's probably as scared of you as you are of him!"
"Well, Grandma," replied Johnny, "if he's as scared of me as I am of him, then that water ain't fit to drink!"



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