This research aims to study the absorption of potassium ions. And increasing the purity resin from biomass in biodiesel is not pure from biodiesel KUB-200 by using plants that are biologically identical three types to compare performance to make the purity of Dubai. diesel highest Eichlornia crassipes, Typha latifolia and Scirpour Lacustris an adsorbent which is a water plant species quickly has hindered the passage of water, transportation and water. It is safe to be used as adsorbent. A porous sponge-like structure helps filter out organic profile. And is capable of absorbing. Because the roots or stems absorbent toxins. As intermediaries to filter and absorb sediments and solids suspended in the water.