We just moved into our home and the previous owner left her Vita Spa L200. We are newbies and know very little. My husband and I emptied the hot tub cleaned the tub with water and vinegar. Then we filled it back up. On Sunday 10/20 @ 4p the water temp was 58. Monday morning @ 0600 the water temp was 67. Does it normally take this long to heat the water up. The aeration is running on low?