Chemistry is generic; solutions to chemical problems are specific and market dependent.

But, even the chemistry is indeterminate until you have reasonably accurate test results, and that's one of the things you're missing. Unfortunately, good pool testing supplies are pretty much a US-only product. Palintest (UK) and Lovibond (DE) make some decent testing products, but they remainl inferior, and cost 3x as much (> $300 US). Up until 2002, I could (and did) ship US kits to customers in Asia and Africa, but the post-9/11 security restrictions eliminated air shipments of chemical products of any kind.