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In the majority of cases, it's best to use either the Manufacturer photo paper (so HP paper in a HP printer) or our Own Brand paper which is designed to work in the majority of popular printers. These papers are built by the manufacturer to work specifically with those manufacturers cartridges, optimising for factors such as absorption rate, dispersion and droplet size.
While you can mix brands, there is no guarantee that the style of ink they use will work with your paper. So for example, some Epson glossy paper gives amazing results in HP photo printers, but use that paper in a Canon and it's... well... let's just say it's not so good.
GSM is the weight of a paper and stands for grams-per-square-meter. You need to check this figure as each printer can only take up to a certain weight of paper.
There's no hard rule about this. Generally, the heavier the paper the better quality it is, so photos SHOULD look better on 240+ paper than on money-saving 100gsm paper. We normally recommend doing trial prints on lower quality paper, cracking out the heavier quality paper for the important final copy.
Sorry for the unhelpful answer here; it differs by printer.
You'll need to check the manual or online user guide for your printer to see the max GSM it can handle. As a general rule of thumb most home printers can take up to 240 GSM with ease, anything heavier and we definitely wouldn't buy without checking.