Author Topic: slow sand filters for water  (Read 2038 times)

Offline Artos

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slow sand filters for water
« on: September 29, 2010, 04:39:13 PM »
I almost put this in emergency preps, but since the lead time to make one is long and the item is not portable, I think it goes more to long term self-sufficency so I put it here.

The water filter longevity question on a recent show reminded me of this design for a slow sand filter that scrubs all organics from water.  You still have to screen and pre-filter to keep the flow rate of the filter up, but it can be constructed from local materials (concrete or clay and clean sand).

http://www.cd3wd.com/cd3wd_40/vita/wtrtreat/en/wtrtreat.htm

This is a fairly long and technical paper, I have it printed out and plan to build some of these at the first opportunity.

Offline Uberman

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Re: slow sand filters for water
« Reply #1 on: October 08, 2010, 02:23:03 PM »
Artos, I was glad to see your post, I have been researching this filters a bit. I found a few good videos on youtube that show the filters people have made but thought this one was a good construction video.  After seeing it I have put a sand filter on my projects list right by greenhouse, solar collector, solar chimney, pond ....
http://www.youtube.com/watch?v=2KQNzhK9-mA#

Offline Uberman

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Re: slow sand filters for water
« Reply #2 on: October 08, 2010, 02:24:52 PM »
Arto one more you might like.
http://www.youtube.com/watch?v=zHilE1ukkjY#

Offline Artos

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Re: slow sand filters for water
« Reply #3 on: October 09, 2010, 10:49:40 AM »
Those are really great!  The plans I have seen so far have involved permanant concrete structures but I figured there had to be a more modular approach.

Offline OKGranny

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Re: slow sand filters for water
« Reply #4 on: October 09, 2010, 12:06:33 PM »
High iron content in water in a great deal of our area makes the larger concrete ones a necessity for a lot of people. The only problem is that there is so much iron that they have to remove the tops and scrape off the top several inches of sand anywhere from every couple of months to once a year. That can be a problem if you have any physical limitations but if you don't have the sand filter the iron ruins the water pump in about a year and a half. Replacing a pump every 18 months is expensive, time consuming, and annoying.