Vitec® Selection Guide
click for PDF
Without some means of upstream scale inhibition, RO membranes and their flow passages will foul due to the precipitation of sparingly soluble salts. Common examples of scale are calcium carbonate (CaCO3), calcium sulfate (CaSO4), barium sulfate (BaSO4), and strontium sulfate (SrSO4). Less common but equally problematic are silica (SiO2) and calcium fluoride (CaF) scales.
Avista Technologies provides a range of antiscalants suitable for treating well, surface, municipal and recycled waters. The Avista Advisor chemical projection programme is provided to assist customers in selecting the most appropriate antiscalant for the application and to determine the minimum effective dose rate.
| CCPP: | 900 |
| CaSO4: | 7 x Ksp |
| SrSO4: | 35 x Ksp |
| CaF: | 1000 x Ksp |
| LSI: | 3 |
| BaSO4: | 105 x Ksp |
| SiO2: | 250mg/l in brine |
The table below details the functionality of the antiscalants provided and the table overleaf gives a guide to typical waters each is applied to.
Avista Technologies antiscalants are certified under ANSI/NSF 60 and other national drinking water standards (including the UK drinking water standard) for use in potable water systems. Additionally, the products have been tested to demonstrate compatibility with the major membrane manufacturers products.
See Also:
Individual product datasheets for particular properties and application notes for each product.
Tech support section which provides information on how antiscalants work, a guide to water sampling for antiscalant projections and system Normalisation details so you can monitor your antiscalant effectiveness.
The Avista Advisor 3 software is also available to allow you to calculate your required antiscalant dose.
Avista Technologies can carry out your water analysis or produce your antiscalant projection. For particularly unusual conditions (or highly variable ones) pilot testing can be carried out in our lab or on site.
Product approvals have been granted by water regulators, membrane manufactuers and industry bodies. Please contact your local representative for up to date information.
