The objective of present work was evaluating the influence Phragmites australis (common reed) and Lemna minor (duckweed) aquatic plants in the reduction of total hardness and chlorides present in the waters of wells of Huanchaquito- Trujillo. They are used by the inhabitants to irrigate crops and own consumption, affecting their health and having low production in their fields. The aquatic plants used for the treatment of well water, according to background, have a high yield in salt absorption which has allowed to decrease the amount of Chlorides and hardness present at the well’s waters of Huanchaquito every 15 days for 8 months. The data obtained in the analyses of the initial samples were: With respect to hardness 542,7 ppm; Cl- amount 300,7 ppm. After the average data obtained for the hardness were of 502,4 ppm with Lemna minor only 537,6ppm, with Phragmites australis only and 489,8 ppm with Lemna minor and Phragmites australis, In terms of the results of chlorides we have: 296,9 ppm with Lemna minor only, 248,8 ppm with Phragmites australis only and 233,8ppm with Lemna minor and Phragmites australis.