Chofetz Chaim Daily 4 Tishrei. Intro. Widespread nonobservance of hilchos LH is because of: 1)Ignorance of the laws 2)False heterim. This is primarily because there was no sefer that clearly spelled out all the halachos.
Chofetz Chaim Daily 5 Tishrei The sefer Chofetz Chaim was written to educate the public in keeping the laws of LH and Rechilus. Content is gathered from Rishonim and Poskim. The main text is concise law. Sources are spelled out in the Beer Mayim Chaim.