You are using an outdated version of Microsoft's Internet Explorer web browser, which does not display modern web sites properly (including this one). To ensure you always see sites at their best and your browser security is up to date, it is highly recommended that you upgrade to a modern browser.
Yes, all Goldacres tanks feature a large sump and large drain to ensure the complete drainage of the tank contents. The drain can be opened and closed remotely to ensure operator safety.