Spa Frog
I gave this a 5 star rating and have not used it yet I have however used the Pool Frog and there are not enough stars for this product! I did not hesitate to order the Frog system for our hot tub. The price is the cheapest I have seen. If I change my mind about the stars, I will update but I am so convinced of the quality that I doubt I will. Thank you for offering great prices!