We have an under sink water filter. These things cost about fifty bucks for just the canister. You can't completely empty them. We use our moho for about 3-4 weeks out of the year. Cant we somehow use...
I have a 10,000 gallon "whole house" water filter in mine. it was an option. I only get the filter for it when I`m going to be using the fresh water tank. I also have an undersink drinking water filter with dedicated faucet. I use the same filter all year long. I too use it about 3-4 weeks a year. no issues!