Filter
Top Products
25
4. Find the temperature correction factor (TCF) from Table 1 on [page 26].
5. The base flow rate can be calculated as follows:
BASE FLOW RATE = (TIME IN SECONDS TO FILL 1 GALLON (3.78 LITERS)/(TCF)
EXAMPLE: If the temperature of the water is 68° F (20° C) and it takes 71 seconds to fill a gallon,
TCF from table 1 for 68º F (20° C) is 1.19
Base flow rate = 71 / 1.19
= 59.66
The base flow rate is the flow rate during the first 24 to 48 hours of the operation of a new membrane and
machine. It may be different for every membrane. Write down the base flow rate for your particular
machine on your maintenance sheet.
6. We recommend that the product water flow be checked every two (2) months. Follow step #1 through
step #4 and obtain a new TCF and a new time (in seconds) to fill 1 gallon (3.78 liters). With the new TCF
find the cleaning limit. The membrane needs cleaning when the new time to fill 1 gallon (3.78 liters) exceeds
the cleaning limit.
CLEANING LIMIT = (new TCF) x (BASE FLOW RATE) x 1.17
EXAMPLE: If the new temperature is 79º F (26° C) and it now takes 63-seconds to fill a gallon, TCF from
Table 1 for 79º F (26° C) is 0.97 and from the above example, the base flow rate for our
membrane is 59.66.
CLEANING LIMIT = 0.97 x 59.66 x 1.17 = 67.71
Since it only takes 63-seconds to fill 1 gallon (3.78 liters) (less than cleaning limit of 67.71), cleaning is not
required yet. It would, however, be prudent to order the cleaning kit at this time.