I have well water that has a lot of hard water due to limestone rock all around our house. I am thinking of buying a whirlpool gold (model whelj1) central filter system as it does not require replacing filters and it could fit into my water where an old water softner is now. Do you have any knowledge of this type of filter by whirlpool? If it is any good, it might pay for itself in savings on filters. (I now pay about $70 a year on filters).