Just a note to let you know how great SilkBalance is. When I bought my hot tub last year I was assured that the maintenance for the tub would be very easy and not that expensive. I was apprehensive but I must say, I am very pleased with this product. It only takes a small amount on a regular basis along with the daily use product and my tub is virtually always sparkly and clear. Thank you for recommending SilkBalance,