I did not know it has alumunium in DE?Is it harmful Hv.

Raw DE does contain aluminum oxide.  It is believed though that the aluminum does nto present a problem because the silica binds the aluminum preventing it from harming the body.  This is the same concept that people claim zeolites (aluminum silicates) do not pose a problem for body. Zeolites are becoming a popular detox tool recently from MLM marketing.  I have used them for many years in my aquariums. They are sold in aquarium stores under the name "ammonia remover".  So far none of my fish show any signs of Alzheimer's.  Actually my concern about the ingestion of aluminum silicates is whether or not the stomach acid will have any action on the release of the aluminum from the aluminum silicate.  I have not seen any studies one way or the other.  So I work with purified DE that has been treated with acid to remove the mineral oxides then rewashed and dried.  But the raw material suppliers do not sell to the general public.

Personally I don't think that the aluminum is going to present much of a problem.  The amount in minimal to the amount of silica, so there is more than enough silica to bind all the aluminum.  And phytates, pectins and algins in or diet are effective metal chelators.  So the risk of aluminum toxicity is pretty much zero.

We are actually exposed to more lead through our diet than aluminum.  Luckily silica, phytates, pectins and algins also help to remove these.

 http://en.wikipedia.org/wiki/Diatomaceous_earth

Diatomaceous earth (pronounced /ˌdaɪ.ətɵˌmeɪʃəs ˈɜrθ/) — also known as DE, TSS, diatomite, diahydro, kieselguhr, kieselgur, brand names include Celatom or celite — is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder, with a particle size extending from less than 1 to over 100 microns, but typically around 2 to 10 microns. [1] This powder has an abrasive feel, similar to pumice powder, and is very light, due to its high porosity. The typical chemical composition of diatomaceous earth is 86% silica, 5% sodium, 3% magnesium and 2% iron.

Why do you believe it has alumium in it? I have never heard that.

DE contains a number of metal oxides, including calcium, magnesium and aluminum.

 Check some earlier posts on this forum. Food grade DE shouldn't contain aluminium.
Google on this forum where to buy it, I remember there's talk about it.
Suz.

Actually if you check the analysis of what some people are selling as food grade there is still aluminum in it.  Here is an example:

http://wolfcreekranch1.tripod.com/diatomaceous_earth_analysis.html