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I read that there are 2 types of phosphate absorbers: iron oxide (rust color) and aluminum oxide (white). But my concern is the removal of silicates (not phosphates) from my tap water. Can somebody here tell me which is better of the 2 types in removing the silicates?

Thanks for your replies.
 

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They are also very different products. GFO's have to be run in a reactor. Phosgard does well in canisters, or even air-driven box filters.
 

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any further explanation why aluminum oxide works better in absorbing silicates?
If you want to look into purchasing / building a reactor to run GFO, you'll have your answer. It isn't better, it's just infinitely more convenient. Additionally, GFO will strip trace elements as well.
 
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