FROG® Serene Spa Cartridge Kit – 1 Mineral + 3 Bromine (4‑Month Supply) – part #01-14-3824

Exactly the same as what I used to buy at the spa store...but I got 4 instead of two...great price...shipping time was reasonable, but I wish it was offered on Prime. Also have learned the reason that there are 3 bromine and only 1 mineral-you are supposed to change the bromine (yellow) every month and the mineral (blue) every 3 months. The spa store never shared this information, so I was replacing the blue too much and the yellow not enough. This is helpful information. Now I will buy this set once a quarter.

great way to maintain a balance in you Spa. Always looking for the store offering the best price for this great product, I have used it for years along with their test strips to maintain proper ratios of chemicals.

Exactly the same as what I used to buy at the spa store...but I got 4 instead of two...great price...shipping time was reasonable, but I wish it was offered on Prime. Also have learned the reason that there are 3 bromine and only 1 mineral-you are supposed to change the bromine (yellow) every month and the mineral (blue) every 3 months. The spa store never shared this information, so I was replacing the blue too much and the yellow not enough. This is helpful information. Now I will buy this set once a quarter.

Great quality and price.

Arrived as expected. I just don't understand how it is so expensive ?