pool is an AG (above ground) 24' round 15500 gl /Sand filter, Deramworks by Hayward 100#/ Hayward 1.5 hp single speed pump runs 24/7 and until this year 365/ pool installed in 2004 new liner in 2011/ none- in store testing Baquacil/ Zodiac Ranger suction Cleaner /water supplied from a well.