I purchased a new house in June with a free form AG pool. I was paying for pool maintenance to the tune of $130/month (including chem), however, I recently decided to do the work myself. Part of the reason I made the decision: a week ago I took water sample to Leslie's same day after pool service and discovered that there was no chlorine in the pool and readings from pool guy and readings from Leslie's were not even close. I has been a week now and so far things are good. My question to the forum: with low bather loads, is weekly shock treatment required or can I just keep chlorine sanitized with autofeeder and weekly algae control treatments?