Built a semi raised pound approximately 4500 gallons fitted with a Oase ProfiClear Premium Compact-M Gravity EGC. Every thing works fine however the cleaning cycle takes alot of water out, water level can drop by 12 inches a week in hot weather. It is not leaking or anything like that, just looking for any ideas on how I can retain the water, leave waste. At moment the waste goes into a garden. I have a pump for the skimmer, pump for filter.