I have had my water filtration system since 2016 when the company was called AquaLiv. I don't know if it is now under new ownership or management but the price of the set of filters increased this year by $20 so the $20 coupon saved me nothing in comparison to years prior. When I first started buying filters I could get a set for about $80 with a coupon, a price increase still allowed me to purchase the filters for right around $100 which was still reasonable. Now the price has gone up $20 more but the coupon is the same so I'm not really saving anything now. I will be looking for another water filtration system that has more affordable filters. I only paid $397 for my system when I bought it in 2016 and that included shipping etc. The filters shouldn't cost $140, nearly half of what I paid for the entire unit with filters!