Product Overview

Quality-ALK is a high-pH liquid formulation primarily designed to remove sulfate scales, organic matter, colloids, microbial slime, and particulate matter. It is suitable for aromatic polyamide reverse osmosis (RO) membranes, microfiltration (MF), nanofiltration (NF), and ultrafiltration (UF).Excellent cleaning performance extends membrane run time. For optimal cleaning results,Quality-ALK should be used in conjunction with Quality-ACD.

Advantages:

• Suitable for all aromatic polyamide membranes
• Contains a strong chelating agent and low-foam surfactant to accelerate the dissolution of sulfate scales
• Also effectively removes oil, organic matter, and biological slime from the membrane surface
• Contains buffering agents to inhibit pH changes, maintaining the cleaning pH between 10.0 and 14.0
• Liquid formulation shortens mixing time
• Effectiveness is enhanced by increasing temperature

Physical and Chemical Properties:

• Physical state: Liquid
• Specific gravity: 1.05 ± 0.05
• Appearance: Pale yellow or colorless liquid
• pH value: 2–4
• Freezing point: -5°C
• Solubility: Completely soluble in water

Dilution:

The typical dosage in the cleaning tank is 1–3% concentration of the product.

Cleaning Instructions:

Inspect and flush the entire RO cleaning system to keep it clean.
Before cleaning, the type of fouling on the RO membrane elements and the cause of this fouling must be basically identified, so that the cleaning targets the specific problem. After cleaning, analyze the cause of fouling and implement corresponding pretreatment prevention measures.
During the cleaning process, the temperature of the cleaning solution must always be maintained within the required temperature range (30–35°C).
The cleaning flow rate should use the value recommended by the membrane manufacturer
or VCS. Additionally, the flow rate magnitude and the length of soaking time should be determined based on the type and degree of membrane fouling. If no such recommendation is available, VCS technical engineers can provide guidance based on the actual system conditions. For heavily fouled systems, it is highly advisable to consult a VCS technical engineer during cleaning to obtain the optimal cleaning solution.
For multi-stage RO systems, it is best to clean each stage individually to achieve maximum effectiveness. If the cleaning solution be comes turbid or the pH goes beyond the range recommended by VCS, prepare fresh solution or replenish the cleaner. Before returning the system to service, it must be flushed with RO permeate.