Postby Walter » Fri 25 Aug, 2006 07:43
if it is just everytime you backwash i would think it is okay unless it is a large amount, what is happening is when the sand is being churned in backwash it is going into stack pipe and being pushed out which is fine. As for adding sand anyone can do it, it should be about 3/4 full but make sure you cover the stack pipe opening up before adding sand.
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