Why do I get scaling and spotting when I am using sediment and carbon block filters?

Here is a question I get periodically from my customers

Dave

Hi Dave-

Curiosity question...

 

As in the attached sample pics, why would I get this scale buildup behind my triple filter set- 5 micron -> 1 micron -> .5 micron carbon? I maintain the filters.

 

Regards,

B - Full time RV'er

 

 

Hello Bill, 

   Scaling is caused by hard water.   Hard water is water with a high pH and lots of minerals, especially calcium and magnesium.   In hard water, these minerals are fully dissolved in the water, so even a .2 micron ceramic filter or a 0.5 micron carbon block filter is not small enough to remove them.    To get them out requires a water softener or reverse osmosis.  I would recommend a Double Standard On the Go to soften the water and remove calcium and magnesium.

 

Thanks!
Dave