We recommend changing the sand ever

We recommend changing the sand every five years. While we have seen filters go 20 years or more without changing the sand and still do the job, they are not as efficient as they should be.
Filter sand has been ground to a size of .45 to .55 mm in diameter and is very rough when new. This roughness is what makes the sand efficient at filtering out the particles of dirt in your water. As this roughness is smoothed out - as stones in a stream wear smooth over time - your filter's efficiency goes down. This means that your system has to run more frequently to accomplish the same task.

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ผลลัพธ์ (อังกฤษ) 1:

we recommend changing the sand every five years. while we have seen filters go 20 years or more without changing the sand and still do the job, they are not as efficient as they should be.
filter sand has been ground to a size of .45 to .55 mm in diameter and is. very rough when new. this roughness is what makes the sand efficient at filtering out the particles of dirt in your water.as this roughness is smoothed out - as stones in a stream wear smooth over time - your filter's efficiency goes down. this means that your system has to run more frequently to accomplish the same task.

found that the sand in the filter reaches its end. use

ผลลัพธ์ (อังกฤษ) 2:

We recommend changing the sand every five years. While we have seen filters go 20 years or more without changing the sand and still do the job, they are not as efficient as they should be.
Filter sand has been ground to a size of .45 to .55 mm in diameter and is very rough when new. This roughness is what makes the sand efficient at filtering out the particles of dirt in your water. As this roughness is smoothed out-as in a smooth stream stones wear over time-your filter efficiency goes down. This means that your system has to run more frequently to accomplish the same task.

found that the sand in the filter expires.

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ผลลัพธ์ (อังกฤษ) 3:

We recommend changing the sand every five years, we have seen While filters go 20 years or more without changing the sand and still do the job, they are not as efficient as they should be.
Filter sand has been ground to a size of .45 to .55 mm in diameter and is very rough when new. This roughness is what makes the sand efficient at filtering out of the dirt particles in your water.This is As roughness smoothed out - as stones in a stream wear smooth over time - your filter's efficiency goes down. This means that your system has to run more frequently to accomplish the same task.

found that sand filters in end-of-life.