The PermaSalt system is something we don't recommend; it's a low end copper ionizer system -- not that we recommend high-end copper systems -- and in my opinion, benefits the pool store more than the pool owner.
But . . .
"Activate" is a blend of dichlor (a common chlorinating chemical, available inexpensively at Sams Club) and Oxone (potassium monopersulfate) which we recommend NEVER using.
If you really want to replace "Activate", instead of getting rid of the PermaSalt system, you can buy both diclor and monopersulfate separately. I'll put links to both, below.
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Dichlor "sodium dichloroisocyanurate":
Sams granular dichlor 50lbs @ Sams Club => ~$2.20/lb (May 2018 in Chattanooga)
Sams dichlor bagged shock 24lbs @ Sams Club => ~$2.50/lb (May 2018 in Chattanooga)
Kem-Tek dichlor 22 lbs @ Amazon => ~$3.50/lb (May 2014)
Kem-Tek dichlor 12 lbs @ Amazon => ~$4.10/lb (May 2014)
Kem-Tek dichlor 5 lbs @ Amazon => ~$5.00/lb (May 2014)
Kem-Tek dichlor 2 lbs @ Amazon => ~$9.00/lb (May 2014)
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Potassium monopersulfate, 43%
Doheny's Chlorine Free Oxidizing Shock - 12 lbs
Rx Clear 43% Potassium Monopersulfate - 12 lbs
(Note: potassium monopersulfate (MPS) is rather acidic, and is usually blended with soda ash to neutralize the acidity and cut the manufacturer's cost.)
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