OTO orange is high enough (>20 ppm) to kill algae in most cases, but you may have very high stabilizer -- but there's no way to tell unless you can get an HTH 6-way kit at a local Walmart. The K2006 kit we recommend will take several days to arrive. If you read the Best Guess page (link in my blue sig) will explain why this matters so much.
I'm not sure what water costs in your area, but the quickest and easiest way is probably to refill, and then restart with the Super Simple recipe. Please note that that's not a long term method, unless you drain and refill yearly. But, it will allow you to finish the season out, and learn what you need to, to avoid future problems.
One other factor with Intex pools is the cartridge filter quality. I'll post info about that below.
+ 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: @ AmazonUnicel C-4607 Replacement Filter Cartridge (Intex A or C)Filbur cartridges: @ Amazon
Unicel C-5315 Replacement Filter Cartridge (Intex B Filter
Unicel C-3302 Replacement Filter Cartridge (Intex E)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)
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