High pH + high Alk + adding calhypo is not a good combination as you have found out!
The Intex OEM filter cartridges are low quality. Better cartridges will not only last longer, but will filter out the residual cloudiness better. Read this thread:Cleaning-your-Cartridge-Filter-wiithout-Damaging-It!
Replacement Unicel cartridges:Unicel C-4607 Replacement Filter Cartridge (Easy Set Size A or C) @ Amazon
Unicel C-5315 Replacement Filter Cartridge for 15 Square Foot Intex B Filter @ Amazon
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