I want to thank Lisandro and All Plumbing for their service. I had the maintenance person from the condo association attempt to unclog the drain but he was concern about breaking the cast iron pipe. I had a plumbing service attempt to unclog the pipe. He was unsuccessful and made no recommendations. Lisandro came he said he would try. He answered my questions what would happen if he was not able to unclog the pipe. He gave me an estimate. In the end Lisandro was able to unclog the pipe. He was professional and efficient. The price was reasonable. Thank you All Plumbing.