Filter bag life is application dependent. A high dirt load means the filter bag will block quicker whereas applications with trace dirt will see longer life between changeouts. A correctly sized filter bag can last from weeks to months.

You will notice a reduction in flow rate or an increase in differential pressure. Usually filter bags should be replaced once the differential pressure across the filter reaches 1 bar. If you are operating at higher than room temperature then the filter bag might need replacing before 1 bar dp.

Filter bag flow rates are application dependent. Viscosity, dirt load and unique application requirements should be careful considerations. Here's an estimate for water applications:

Size 1 filter bags: Up to 18 m3/hr
Size 2 filter bags: Up to 36 m3/hr
Size 3 filter bags: Up to 4 m3/hr
Size 4 filter bags: Up to 9 m3/hr

Simple answer is, use felt bags for general particle reduction and mesh bags for removing particles of a specific size/straining.

Also see the following document available in the downloads section of our website 'Filter Bag Media & Construction'

Please contact our sales team if you would like to discuss your application in more detail.

Please see our applications and blog pages for general guidance on micron ratings.

Alternatively, please contact our technical team with your application details. They will be able to provide guidance on micron ratings.

Filter bags are disposable items which should be replaced once they have exhausted. Some customers reuse Nylon mesh bags. If you would like to reuse filter bags then please inspect them regularly to make sure there is no damage.

Yes, all filter bags are manufactured under strict quality control and comply fully with EU food regulations. We supply all filter bags individually wrapped to avoid contamination. Certificates can be downloaded from Downloads section of the website.

Industry standard sizes for filter bags are mentioned below:

Size 1 (7" x 16")

Size 2 (7" x 32")

Size 3 (4" x 9")

Size 4 (4" x 15")

You can also download a detailed information document on filter bags from Downloads page of our website.

Filter bags work by using a porous material to separate particles from a liquid that passes through them. The bag is usually made from a polymeric filter media like Polypropylene, Polyester, Nylon etc with tiny pores that allow the fluid to pass through while trapping particles that are larger than the pore size. As the contaminated fluid enters the bag, clean liquid exits through the walls while contaminants accumulate inside.

On pressurised systems, filter bags are installed inside pressure vessels which are called bag filter housings.

On gravity fed systems, the filter bags are usually suspended under a pipe or tied to the end of pipework.

Here are some considerations for filter bag sizing:

• Flow rate
• Operating temperature
• Size of particles that need to be removed
• Concentration of particles
• Chemical compatibility of filter bag media with process fluid
• Maintenance demand
• Unique application requirements
  

Our sales team can help with filter bag sizing.

Felt bags 1 - 200 micron

Mesh bags 50 - 1200 micron

On special order we can produce mesh bags down to 1 micron.

Free on orders over £50.00 anywhere in the UK.

Filters are usually picked and packed same day or next day. Standard courier transit time is one working day for UK mainland. This can be longer for Scottish highlands and Northern Ireland and some shipments to these areas can take up to seven days.

If the product you require is not in stock and your requirement is urgent, then please get in touch with us. We might be able to offer an alternative solution. New stock is added regularly and typical lead time is 5 - 15 working days.

Yes, we can usually offer an alternative option, please get in touch with us and we will advise.

Yes, the website automatically calculates shipping charge for international customers. If you would like to collect on ex works basis then this is also possible. Please order directly by sending us an email if you would like to collect on ex works basis.

Yes, you can collect on ex works basis from our warehouse in the UK. We will need to input the order manually for this so please send us an email with your requirements.

Yes we accept returns within 30 days of despatch. Please see our returns policy for more information.

You can start the return process through your account area. Please also see our returns policy for more information.