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I have high nitrates in my tap water, i dont really want to use an RO unit because then i have to remineralize. I will be using 2 SunSun 304B filters on my 125 gallon tank. My question is, can i fill all 4 trays in both filters with the matrix so maximize my results of lowering my nitrates? All help will be greatly appreciated. I have attached a photo of the trays that are in my 2 filters.