We Can Support With Your Water Filtration Requirements
Applications support is a key function of the Medical Scientific and Laboratory Services team, either on-site or in our dedicated laboratory facilities. Our technical support service for water filtration can be customized for your applications. For example:
- Inline applications such as in washer disinfectors in endoscopy reprocessing departments, for protection of reverse osmosis upstream of dialysis circle lines, or for any flushing as part of a medical “process”.
- Point-of-entry or process filtration solutions. We can advise on filter housings and filter modules based on hygienic and point-of-installation requirements.
- Point-of-Use or terminal water filtration. We can advise the best product based on shower and tap activity space and their specific needs.
We Offer Ongoing Technical Support
- Used filters can be returned to one of our laboratories and analysed for blockage or filter integrity.
- We can investigate compatibility of filters with specific systemic or surface disinfectants either on-site or through application simulation in our laboratories.
- We are able to confirm retention of micro-organisms of clinical interest or endotoxin retention
Silt Density Index (SDI) Testing
Particle loading has a detrimental impact on water distribution systems and components within it, impacting cleaning regimes, component operation and usable life. Pall can test water from different points within an in-premise water distribution system to determine the particle loading. This is done by an SDI test which is based upon the rate of blockage of a 0.45 µm filter at a defined water pressure. We can also perform a modified SDI test that investigates the effect of various upstream pre-filters on the SDI value. This SDI test is a useful tool for estimating the potential life of a Point-of-Use Water Filter and the selection of appropriate pre-filtration where necessary.
For development of new products, new applications or for investigation of used filters, understanding the water flow and the degree of any blockage is very helpful to support the needs of our customers. Analysis of the filter media layers can assist to identify the origin of any contamination and provide information with respect to particle size (see SEM/EDS section for additional details).
Process and Point-of-Use Water Filters are used under a variety of conditions with exposure to surface and/or systemic disinfectants. SLS can conduct tests that mimic the application with respect to specific chemicals, dosage concentration and exposure time to assess the effect on filter housings and membranes and determine compatibility.
Thermal & Pressure Compatibility
Bacterial challenge studies may be necessary to provide documented evidence of a filter’s capability to remove bacterial contamination. We typically use a method based on the industry standard ASTM F838-20 “Standard test method for determining bacterial retention of membrane filters utilized for liquid filtration” using Brevundimonas diminuta (ATCC 19146). Other micro-organisms can also be specified, and tests can be performed using a model system or a specified fluid; in which case protocols are developed in consultation with the client.
Endotoxin can be found in potable water and purified water provided by reverse osmosis, often because of bacterial contamination. Pall can simulate process parameters, design protocols and test filtration membranes capable of retaining endotoxin, under your process parameters to evaluate performance. Data may also be used to establish best process conditions and the most effective filter media for the operating environment and application.
Integrity tests (which are correlated to bacterial retention) can be applied to confirm the integrity of a filter. This non-destructive test is often performed at the request of a customer to demonstrate that the filters are compatible with their specific application and perform as per their intended use.
Thank you for your interest. We will be in touch soon.