You may be wondering what the reference to micron means while trying to select a water filtration system for your home or office. You may be thinking about what is the best micron rating. Let's find out.
What is a micron rating?
Micron is a measurement; the symbol is μm; 1 μm is 0.001 mm or 0.000039 of an inch, here are some examples:
- Fine beach sand - 50 to 2000 μm or 0.0019-0.0787 of an inch (0.05 to 2 mm).
- Human Hair - 70 μm or 0.0028 of an inch (0.07 mm).
- The smallest particle visible to Human eye – 40 μm or 0.0015 of an inch (0.04 mm).
A filter with a micron rating of 5 μm will remove or filter out contaminants of 5 μm or larger. Also, look for the efficiency rating of how well the filter removes particulates.
How to choose the right micron rating?
Unless you undertake a costly particulate analysis on your feedwater performed by a laboratory, the next best method to estimate the micron filter size required for your feedwater is trialling filter sizes.
Start with a low micron rating filter, such as a 5 μm. If you find this clog too quickly, losing water pressure to your home in a short period, try choosing a higher micron rating, 20 μm for example until you find the right balance between micron size and duration of time before it clogs.
You are looking for a filter that can give you at least 3-6 months of service before it needs replacing. A clogged filter means it has performed its job and removed the particulates; unfortunately, this also binds the filter and restricts water passage.
Larger Surface areas and Depth Filters
Filters are available in different sizes, most common is 10 or 20-inch in length and either slimline 2.5-inches or Big Blue 4.5-inches in diameter. They are also available in a selection of materials and pore sizes (microns).
Pleated filters can be washed and reused but hold less dirt than a depth filter. Depending on your flowrate requirements and how many particulates are in you feed water will determine how long the element lasts between filter replacements and what size filter element you require.
If you're finding a 10 x 2.5-inches 5 μm depth filter blocks in 1-2 months, try a 20 x 2.5-inch, extending the filter's life or even the much larger 4.5-inch diameter depth filter with even more dirt holding capacity.
Multiple Filter stages can help
Suppose you have very low feedwater quality with very high sediment levels. In this case, you may want to consider having multiply filters to stage the filtration, so they don't block so quickly yet still protect your home.
An example would be two filters in series. The first a 50 μm, the second a 5 μm; this combination would share the dirt loading capacity between both filters, extending your filter change window while maintaining water flow and pressure.
Having two inline filters allows you to remove smaller containments keeping your home appliances protected from tiny grains of silt and dirt.
Standard Universal Cartridges
SimPure has an extensive range of sediment filters made from food-grade Polypropylene (PP) in various lengths, from depth to pleated cartridge element designs depending on your requirements.