20
Preservative Solution
The module is shipped, filled with an aqueous preservative solution of 30% calcium chloride.
Adhere to the precaution below when handling the module. Also, if these preservative solutions are
subject to regulations on chemical substances in your country, take appropriate procedures on
your own initiative. Prior to module use, raise the module upright to fully drain preservative solution
from the module. Rinse thoroughly with clean water before use, should preservative solution
adhere to the module housing and equipment. Refer to the rinse data below when rinsing out
calcium chloride.
Caution
The membrane is wetted with a 30% calcium chloride solution. Always wear
protectors, such as safety goggles and rubber gloves, to prevent skin contact and
eye contact.
Precautions
This solution is highly corrosive to metals and should be thoroughly rinsed off with water (e.g.,
tap water) if contacted with peripheral piping or metallic frame components. If End cap A
(stainless steel) is used at the bottom of the module for connection as illustrated in Figure 9,
ensure that the calcium chloride solution is fully drained and take extra care not to allow the
solution to adhere to any metal portion. Clean water, such as tap water, is defined as water
having low turbidity and low organic content. Use to avoid impacting membrane filtration
capacity (flux).
Caution
A solution containing calcium chlorite is highly corrosive to metals and should be
thoroughly rinsed off with water (e.g., tap water) if contacted with peripheral piping
or metallic frame components.
Preservative Solution Flushing Method
Modules and amounts of their preservative solution and calcium chlorite contained
UNA-600A
UNA-660A
UNA-620A
Preservative solution (kg)
6.0
–
7.0
8.0
–
10.0
11.0
–
13.0
Calcium chlorite (kg)
2.0
3.3
4.0
