The HTH 6-way is made by Taylor, and is good enough for now. The TA, CH and CYA tests are the same as the K2006, though there's less reagent.

HTH is *NOT* a trustworthy brand.

15 years ago, it was more trustworthy than any of the BioLab brands (BioGuard, HydroTech, Pool Time, Aqua Chem, Omni, etc.) but it was not profitable enough, and Olin spun it off as an independent, Arch Chemical. Several years ago, Arch hired a former Sr VP from BioLab to be the Arch CEO, and Arch / HTH has gradually become JUST as deceptive and predatory as Biolab.

Fundamentally, there are NO pool chemical brands that are genuinely worthy of trust, but BioLab set the mark in using skilled marketing and high tech methods to sell baking soda ('sodium hydrogen carbonate' => alkalinity increaser) for $2 - 3 per pound MORE than the grocery store price.

What's worse, both BioLab and Arch/HTH sell chemicals you should never, or almost never, put in your pools.

That doesn't mean that everything made, or sold, by BioLab or Arch is a bad product or a bad deal: we often recommend the HTH 6-way, made by Taylor, since it's available locally, and the K2006 is not.