I put all the links together in one place for you.

You do NOT have to get the Brute cans, or the TSP from Amazon; you can probably find TSP and some acceptable cans locally. I just included them so you know what you are looking for.

Also, one of my moderators felt I was pushing Amazon Prime too much -- so I'm not pushing it. I included the link because you can get free 2-day shipping with it IF you sign up for their 1 month trial. You will have to remember to cancel it, however. I buy from Amazon a lot myself (we home school, and have been using Amazon for years!), so Prime works for us.

Please note, to get the maximum benefit of the Unicel cartridges, you need TWO so one can be soaking, while the other is working.
Kem-Tek Stabilizer 4lbs

Unicel C-5315 Replacement Filter Cartridge for 15 Square Foot Intex B Filter @ Amazon
1lb Savogran 10621 Trisodium Phosphate (TSP) @ Amazon

Rubbermaid BRUTE Gray 10 Gal Container w/o Lid @ Amazon
Round Brute Lid For 10-Gallon Waste Containers, 16" Diameter, Gray

Amazon Prime