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 I don't understand the conversions to ppms, but 4% is sounding like an awful lot of Al! 

Does the silicon bind to the Al and drop to the bottom? 

SO,  should we use raw DE???

What are the health effects of aluminum in water?

 The total aluminum concentration in the human body is approximately 9 ppm (dry mass). In some organs, specifically the spleen, kidneys and lung, concentrations up to 100 ppm (dry mass) may be present. Daily aluminum intake is approximately 5 mg, of which only a small fraction is absorbed. This leads to relatively low acute toxicity. Absorption is about 10 μg per day. These amounts are considered harmless to humans. Silicon may decrease aluminum uptake. However, once the element is taken up in the body it is not easily removed.
Large aluminum intake may negatively influence health. This was connected with nerve damage. Particularly people with kidney damage are susceptible to aluminum toxicity. There is a risk of allergies. Aluminum is probably mutagenic and carcinogenic. A correlation between aluminum uptake and an increased number of Alzheimer cases is suspected. However, this is uncertain because aluminum concentrations always increase with age. Increased aluminum intake may also cause osteomalacia (vitamin D and calcium deficits).
Aluminum intake mainly occurs through food and drinking water. The most recent standards were between 50 and 200 μg/L. Aluminum particles may cause functional lung disorder.
No known diseases are linked to aluminum shortages.
Aluminum chloride may corrode the skin, irritate the mucous membranes in the eyes, and cause perspiration, shortness of breath and coughing. Alum increases blood clotting.

Read more: http://www.lenntech.com/periodic/water/aluminium/aluminum-and-water.htm#ixzz0VGdo6LCh

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