Duro clean IF Mode D'emploi page 5

Tannins (Humic Acid)
Tannins (also know as humic acid), which are present in some supplies, are the result of decaying vegetable matter. If the
tannin concentration is above approximately 0.5 ppm, it will form a sticky coating on the media, thus rendering it incapable of
filtering the iron. A chemical free iron filter is not recommended for this situation. If the tannin concentration is less than 0.5
ppm, a chemical free iron filter may be installed.
Hydrogen Sulfide (H
Hydrogen sulfide (often referred to as "sulfur"), is easily detectable by its objectionable "rotten egg" odor. Sulfur corrodes iron,
brass, copper and silver. A chemical free iron filter is not recommended when hydrogen sulfide is the only water problem,
although it is capable of removing sulfur concentrations of up to 2 to 3 ppm. Whenever hydrogen sulfide is present,
backwashing must be performed at more frequent intervals and the pumping system MUST include a standard air-to-water
pressure tank with an air relief valve.
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 20 psi. IF pressure is over 50 psi, a pressure reducing valve
must be installed in the water supply line ahead of the hydrocharger (Fig. 1, 2 or 3, Page 5).
2. The pumping rate of your well pump must be at least 5 gallons per minute (gpm) for satisfactory operation of the
hydrocharger. In addition, the pumping rate must equal the required backwash flow rate of your model (see Specifications
on Page 1 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 data in the following formula:
DRAW-DOWN _______÷ CYCLE TIME ______________x 60
(gals)
EXAMPLE: DRAW-DOWN is 6 gals; CYCLE TIME is 53 secs; then, PUMPING RATE equals:
6 gals ÷ 53 secs x 60 = 6.8 gpm
See Specifications on Page 1 for minimum flow rates
NOTE: If your pumping rate is inadequate, do not install your filter until the problem is solved.
Locate Water Conditioning Equipment Correctly
Select the location of your filter tank with care. Various conditions which contribute to proper location are as follows:
1. Locate as close as possible to the water supply source.
2. Locate as close as possible to a floor or laundry tub drain.
3. Locate in correct relationship to other water conditioning equipment (see Fig. 1, 2 or 3, Page 5).
4. Filters and softeners should be located in the supply line before the water heater. Temperature above 120
5. Do not install a filter or softener in a location where freezing temperatures occur. Freezing may cause permanent damage
to this type of equipment and will void the factory warranty.
6. Allow sufficient space around the unit for easy servicing.
7. If your water source is a community water supply, a public water supply or you wish to bypass water used for a
geothermal heat pump, lawn sprinkling, out-buildings or other high demand applications, refer to Fig. 2 or 3 on Page 5 for
additional equipment required. Also, refer to the NOTE following Step 10 on Page 6.
S)
2
(seconds)
= PUMPING RATE ______________
(gpm)
3
o F damage filters