Description

NALFLEET RO Scale Control – Broad-Spectrum Antiscalant for RO Membranes

NALFLEET RO Scale Control is an advanced liquid antiscalant designed to prevent scale formation inside reverse osmosis (RO) and nano-filtration systems. By controlling common scale-forming minerals such as calcium, barium, strontium and silica, the product helps maintain system efficiency, stabilize permeate flow and reduce energy costs.

This updated formulation replaces previous product numbers PC-191.11R and 777199, and is fully certified according to NSF/ANSI Standard 60 for drinking water treatment applications.

Regular use of RO Scale Control minimizes the risk of membrane fouling, extends membrane life and reduces operational downtime.

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Features

• Effective against a wide range of scale-forming compounds

• Cost-efficient dosing rates

• Compatible with most RO membrane technologies

• Liquid formulation for simple mixing and dosing

• NSF-certified for drinking water applications

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Benefits

• Keeps membranes clean and free from scale

• Helps maintain consistent permeate output and salt rejection

• Reduces downtime, cleaning frequency and energy use

• Extends membrane lifespan and protects system investment

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Specifications

General

• IMO/EU Hazard Classification: C-49

Physical Properties

• Colour: Pale yellow

• Density: 1.36–1.40 g/ml

• Form: Liquid

• Odour: Slight ammoniacal

• pH (1% solution): 10–11

Material Compatibility

Compatible with:
Polyamide membranes (including TFC), stainless steel 304, CPVC, PE, PP, Plasite 4300, Plasite 7122.

Not compatible with:
Brass, Viton, polyurethane, neoprene, Buna-N, EPDM, Hypalon.
Note: O-rings are acceptable for static use but must be replaced if the fitting is opened.

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Directions for Use

Performance Range

NALFLEET™ RO Scale Control is highly effective against:

• Calcium carbonate

• Calcium sulphate

• Barium sulphate

• Strontium sulphate

• Calcium fluoride

• Silica

• Iron-based deposits

Use when silica in brine is under 185 mg/l at pH 7.5 and 25°C.

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Dosing and Continuous Control

For best protection, feed RO Scale Control continuously into the RO feed line.

Typical Dose Rate

• 5–15 ml per m³ of feedwater

Dosing Guidelines

• Install dosing point as close as possible to the RO membrane, typically upstream of the cartridge filters.

• Operate the dosing pump at high frequency and fine-tune the pump stroke for accurate feed rate.

• The product should be fed neat via a closed system to avoid contamination.

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Dilution Guidelines (RO permeate only)

RO Scale Control may be diluted using RO permeate exclusively:

• Prepare fresh diluted solution every 3–5 days

• Inspect the day tank before each refill

• Maximum typical dilution factor: 1:10

• Dilutions greater than 1:10 require preparing new solution every 1–3 days

Bio-growth prevention

In warm climates, adjust the diluted solution to pH 10–11 by adding NaOH to prevent microbial growth.

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Operational Importance

Maintaining low levels of scale is essential for RO efficiency. Severe fouling:

• Increases energy consumption

• Reduces permeate output

• Causes premature membrane failure

• Can block flow channels, making cleaning difficult or impossible

Continuous antiscalant dosing provides reliable membrane protection and maximizes system service life.