I have a filter on my cold water line under my kitchen sink and my refrigerator ice maker. I am thinking of buying a whirlpool central water filtration system (CWFS) to replace these existing filters as no replacement filters are required for the CWFS (saving a lot of money over the long run) and I need to filter out limestone sediments throughout the house. Does anyone have any info on model WHELJ1 Whirlpool CWFS? It cost $377 so I would like to know more about it before I buy it.