Sign Up Now Pick the plan that best suits your needs. GREY 1 refill every other month Salt $35 every other month Potassium $60 every other month WHITE 1 refill every month +Monthly water hardness testing Salt $35/mo Potassium $60/mo BLUE 2 refills every month +Monthly water hardness testing +1 Emergency refill per month Salt $55/mo Potassium $80/mo