VITEC

Vitec®4000

Antiscalant/Dispersant

Vitec® 4000 is a proprietary liquid antiscalant designed to inhibit silica, sulfate, and carbonate scales and disperse colloidal particles in cellulose acetate and thinfilm membrane separation systems.

This formulation is unique in that it inhibits silica scaling at higher concentrations than typical antiscalants, a feature which may allow significantly increased RO system recovery in high silica feedwaters. It retains its performance even in RO concentrate streams containing up to 4 ppm of ferrous iron.

Performance:

Vitec® 4000 antiscalant offers a variety of critical performance and application benefits:

• Protects membranes from silica scale when used in accordance with published limitations of 250 ppm of SiO₂ in the RO concentrate.
• Certified by the National Sanitation Foundation (NSF) under ANSI/NSF 60 for use in systems producing potable water.
• Powerful inhibitor against a variety of carbonate and sulfate scale:

  CaCO3	CCPP > 900 (LSI >2.5)
  CaSO4	3.5 x Ksp
  BaSO4	105 x Ksp
  SrSO4	20 x Ksp
  CaF	1000 x Ksp
  SiO2	250 ppm

• Dispersant qualities reduce colloidal and silt fouling of membrane surfaces.
• Excellent dispersant for alum particles.
• Compatible with all leading RO membranes.

Application:

Optimum Vitec® 4000 performance is achieved when the chemical is injected downstream of multimedia filters and upstream of cartridge filters. In systems using sulfuric acid (H₂SO₄), the best results are obtained when the acid is injected far enough upstream to ensure it is adequately mixed prior to the Vitec® 4000 injection point.

Dosing Guidelines:

Typical dosage ranges are between 2 to 5 ppm. A site-specific dose can be determined using the Avista Advisor computer program.

Like any injected chemical, over or underdosing may cause unnecessary membrane system fouling. Please contact the Avista customer service department for customized dosing instructions.

Dilution:

The maximum dilution for Vitec® 4000 should not exceed 10%. This guideline will protect the effectiveness of the internal bacteriostat, which inhibits bacterial growth within the drum and feed tank.

Packaging and Storage:

Standard regional pack sizes are listed below. Custom packaging can be provided worldwide to meet customer needs. Information on drumless or bulk tanker delivery is available on request.

Specifications Appearance: Light amber liquid pH (as supplied): 4.5 — 6.5 Specific Gravity@20°C: 1.15 ± 0.05

Packaging Formats Americas EMEA Pails 45 lbs 23 kg Drums 500 lbs 230 kg IBC's (totebins) 2500 lbs 1100 kg

DRINKING WATER TREATMENT ADDITIVES CLASSIFIED BY NSF INTERNATIONAL TO NSF/ANSI 60 ON SEPTEMBER 2004 AS STANDARD DRINKING WATER TREATMENT CHEMICAL FOR USE IN REVERSE OSMOSIS SYSTEMS AT A MAXIMUM LEVEL OF 7 mg/l.

09/09