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Purigen is ideal for adsorbing dissolved undesirable organic matter, but will not pick up undissolved/decomposing plant material.
You need to tackle the obvious plant matter with a suitably sized siphon hose or an aquarium vacuum tool first, then let the Purigen handle the dissolved impurities.
As to whether Purigen is good, or does good, in a low tech tank - absolutely - give it a go !
I've used Purigen 24/7 in my low tech planted discus tanks for years.
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