[dredmorbius]

That's doable, though you're increasing initial cost by about 1/3, and doubling consumables, by using two filters.

The net effective increased filtration rate is marginal.

If you can afford this without concern, it's fine, but it's not necessary.

[verdverm]

It works with two and not with one, so pretty much required. The effect is far from marginal in my setup. Also far cheaper then the post link, less than half.

[dredmorbius]

Numerous documented and tested builds with only one.

https://invidio.us/watch?v=kH5APw_SLUU

YMMV.

[verdverm]

Cool, don't really care, happy with my double filtered setup