It is important to remember that it's not just your pool and pool deck that need to be maintained but the joints do as well! From both a safety and an aesthetic standpoint you want to make sure that the joints are filled properly to the surface and with a material that will stand the degradation caused by chlorine. Crack Stix will do this while most typical caulks will not! Our formula was designed to resist chlorine .. and also, if the joint opens up simply reheat it versus having to scrape it all out and replace as you do with caulks.