Filtering industrial water can enable a facility to reuse a quantity of recirculating water that improves water quality and reduces both usage and maintenance costs. There are two methods used for cooling tower systems, including side stream and full stream filtration. Side stream filtration is the most energy-friendly method of removing particulates. This method filters 3-5% the recirculation rate or allows 7-10 turnovers per day.
When considering filtration methods, the following information is needed:
More than half of the cooling tower particulates tend to be less than 10 micron which are considered small (bacteria) while 10+ microns are large.Proposed methods for testing your tower’s water includes checking turbidity, total suspended solids (TSS), and particle size distribution (PSA / PSD). Removing large particles via filtration is helpful, but a high volume of small particles contributes to high TSS. PSD can be performed by a qualified lab with a particle size analyzer, but their equipment may have limitations regarding size and sample concentration. Make-up water can have naturally occurring minerals, but factors (e.g., dust, process fluid, metals) introduced to the open-loop all play a role in fouling a system. Removing a fraction of these elements will have a positive effect on water quality and your system’s health.
Bag & Cartridge
HE Submicron (multimedia)
Sand / Multimedia
Utilized to remove submicron particles.
Ideal for low flow conditions.
May require frequent maintenance for bag exchanges.
Can be used for submicron (0.5-100 micron) fine particulates
Uses cross flow method, high flux
Requires a low volume of water for backflush
Removes large particulates by weight / density
Tends to require high pressure and pump.
Sized for system volume
Difficult to clean
May require a booster pump
Removes >10 micron particulates
May used reduced volume for backwash and auto options
Removes as low as 10 microns
Requires large footprint
Low flux, vertical flow
May require booster pump to overcome pressure differential
High volume for backwash
Harmsco is a leader in the water filtration field with several patents including up-flow design featured in many housing models. Technical Resources Group can provide consumables, housings, and recommends the quality products that Harmsco produces for both commercial and industrial applications. Most models offer 304/316 stainless steel construction, coating, or an electropolished finish. Flow rates vary from 150 GPM up to 2400 GPM and a number are NSF / ANSI 61 listed.
Hurricane: Performs cyclone separation featuring one (or multiple) cartridge filter(s) with multiple models sizes that accommodate flow rates from 150 to 2,400 GPM. These are available in 304 and 316 SS.
The pleated cartridges are designed to remove particulates at micron ratings that vary, dependent on the material and filter media. Harmsco has identified the optimal temperatures, micron, and flow rate for cartridges to meet system conditions. More information is available upon request.