Sand Filter Compaction
Posted 17 September 2007 - 04:45 AM
"How would you know if filter sand was compacted or rounded? What would be the consequences in either instance?"
I'm fine with the 'rounded' part, but am confused with the 'compacted' part.
Is it asking about temporary compaction ie normal compaction of sand resulting from normal use as indicated by an increase in pressure of the filter - which is fixed by backwashing?
After a long time, the sand has become 'permanently' compacted, and needs replacing or excessive backwashing?
Is permanent compaction possible? If so, what are it's signs? And does vigorous backwashing fix it, or must it be replaced?
Posted 17 September 2007 - 11:24 AM
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