Foulant |
Symptoms |
Solution |
Biological
Growth |
Element may have strong odor,
possible mold growth on scroll end. Element will likely exhibit low permeate flow, but
salt rejection will usually be as good if not better than original test. |
AM-22 or
AM-23* |
|
Carbonate Scale |
Usually on tap water or
brackish water elements only. The element may be noticeably heavier than normal. Element
will exhibit low permeate flow and poor salt rejection. |
AM-11 |
|
Iron Fouling |
Rust coloring seen on end of
scroll. Possibly some large rust flakes from iron plumbing. Element will exhibit low
permeate flow and poor salt rejection. Rust colored reject water may be seen on start of
baseline test. |
AM-11 |
| Silica Scale
(Precipitated) |
Same characteristics as carbonate Scale |
AM-99 |
|
Silt or Carbon
Fines |
Brown or black material on
scroll end. Low flow, good early stages. High flow and very poor rejection in later stages
due to the abrasive effects of the material on the membrane. |
AM-55 |
