7
CHECK YOUR WATER PRESSURE AND PUMPING RATE
Two water system conditions must be checked carefully to avoid unsatisfactory operation or equipment damage:
1.
Minimum water pressure required at the filter tank inlet is 25 psi. If pressure is over 50 psi, a pressure reducing valve must
be installed in the water supply line ahead of the hydro-charger (Fig. 1, 2 or 3).
2.
The pumping rate of your well pump must be at least 5 gallons per minute (gpm) for satisfactory operation of the
aircharger. In addition, the pumping rate must equal the required backwash flow rate of your model (see below for
backwash flow rates). To measure the pumping rate of your pump, follow these instructions:
a.
Make certain no water is being drawn. Open spigot nearest pressure tank. When pump starts, close spigot and
measure time (in seconds) to refill pressure tank (when pump shuts off). This figure represents cycle time.
b.
With the pressure tank full, draw water into a container of known volume, and measure the number of gallons drawn
until the pump starts again. This is draw-down. Divide this figure by cycle time and multiply the result by 60 to arrive
at the pumping rate in gallons per minute (gpm). To aid in your calculation, insert the date in the following formula:
DRAW-DOWN ______
÷
CYCLE TIME _______ x 60 = PUMPING RATE ________ (gals) (secs.) (gpm)
EXAMPLE:
CYCLE TIME is 53 seconds; DRAW-DOWN is 6 gals.; then, PUMPING RATE equals:
6 gals.
÷
53 seconds x 60 = 6.8 gpm
See chart on page two for minimum flow rates.
NOTE:
If your pumping rate is inadequate, do not install your filter until problem is corrected.
Backwash Flow Rates
The most important criteria in sizing a filter is the capacity of the pump. The water must pass through the filter media at a service
flow rate that allows it to operate properly. The filter must also be backwashed at a flow rate sufficient to dislodge and remove
captured particulates. Failure to provide sufficient water will cause a build-up of particulates in the filter media, impairing its
filtration ability. In order for your filter to backwash and rinse properly, your pump must be capable of providing the backwash
flow rates indicated in the above specification chart.
Backwash Frequency
NOTE:
Add one person if you have a dishwasher.
How to calculate gallons of water between regenerations
ppm of capacity between regenerations
÷ ppm of iron in the water sample
= number of gallons supplied between regenerations
- reserve capacity (number of people x 75 gallons)
EXAMPLE:
6,000
ppm between regenerations
÷ 4
ppm of iron - 4 is the minimum setting of compensated iron [To be entered by the user]
= 1,500
gallons between regenerations
– 375
gallons reserve capacity (5 people x 75 gallons)
= 1,125
GALLONS - BETWEEN REGENERATIONS
How to calculate number of days between regenerations
