Water in AZ where we wintered was over 50 GPG. My test strips only went up to 50 GPG so don't know how hard it really was. We used about 13 gallons of water per day and I had to regenerate every 10 days. Unless you are using a lot more water than we did and if your hardness is in the range of ours, 3 to 4 days sounds too often.
When I checked with the manufacturer a few years ago
HERE - not the distributor - he was selling a reload package of the media for $35.
BTW The FloPur guy said not to use bleach because it would shorten the media life. To store off it season he said to regenerate it but leave the salt solution in place until ready to use the softener again.