Sand trap rather than filter?

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JimLS

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Have see a few things on sand "trap" filters that work by slowing down the water enough that the sand sinks to the bottom of the pipe and into chambers. I have some sand in my supply and have a filter screen but it clogs frequently. Hoping to put together a sand trap to keep things running longer between cleanings. I haven't seen much on sizing but did some calculations that indicate (if I did them correctly) that a 4" PVC pipe about 4' long should allow adequate time for the particles to settle to the bottom when the flow is about 15 GPM. Anyone have any links to info on this or has tried it?

Here is one of the links I found about it. They used 3" pipe but I think their flow rate was less.

 

WorthFlorida

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Look up "spin down filter". It may be what your are looking to do. Is this for domestic water or irrigation?
 
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Reach4

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I like that homemade approach. I could envision some other configurations, including having a vertical pipe, with the inlet on the side but low, and the sediment drain at the bottom with a valve to blow out the sand. Output would be at the top.

I think most 3 and 4 inch fittings are not pressure rated, not to say that DWV fittings are likely to fail at 80 psi.
 
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