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If you're still having problems, you may want to check this post out

Super Simple Pool Chemistry Recipe

It's not likely that alkalinity is causing your cloudiness. The 2 most common problems with Intex pools are (a) low or inconsistent chlorination, often leading to algae, and (b) poor filtration, due to the low quality OEM cartridges. Draining, refilling and following the recipe will fix the first problem. I'll post info about the 2nd.

+ The OEM cartridges in Intex / Summer Escapes / etc. filters are not high quality. The Intex manuals recommend replacing them completely every 2 weeks. A BETTER option is to replace them permanently with 2 - 3 Unicel or Filbur cartridges, and rotating them through a cleaning solution. Properly maintained, these cartridges should last all season AND filter better. So even if they cost more per cartridge, they cost less per season! Learn to maintain them, by reading this post, Cleaning-your-Cartridge-Filter-wiithout-Damaging-It!

But, purchasing them is tricky. Amazon does not consistently stock them, and some of the 3rd party sellers are charging high prices and/or high shipping. So, check the Amazon link, but watch out for the prices and shipping costs.

It would be nice if you could just buy them elsewhere, but many of the online pool stores are listing Pleatco or other Asian made low quality filters, as "Unicel C-4607 type" or "fits Unicel C-4607". So shop carefully!

Here are the Amazon links:

Unicel cartridges: @ Amazon
Unicel C-4607 Replacement Filter Cartridge (Intex A or C)
Unicel C-5315 Replacement Filter Cartridge (Intex B Filter
Unicel C-3302 Replacement Filter Cartridge (Intex E)
Filbur cartridges: @ Amazon
Filbur FC-3710 Antimicrobial Replacement Filter Cartridge (Intex A or C)
Filbur FC-3752 Antimicrobial Replacement Filter Cartridge (Intex B)
Filbur FC-3751 Antimicrobial Replacement Filter Cartridge (Intex E)