I received a reply today (24th July) from the council about the second pool in Swanshurst Park (mentioned on the 20th July post 'Swanshurst Park: Fenced off'):
Hello [name] - thank you for your recent enquiry regarding pools in Swanshurst Park. The second pool identified on the website relates to a pool/boggy wetland area located in the bottom portion of the park. During winter this is quite a large body of shallow water but in drier months tends to dry out and become more boggy.
Hope this answers your question