We bought a new home last October (in MN) and it has a inground 30,000 gallon pool. It has a sand filter with a automatic chlorinater. and use the chlorine pucks. We used well water to fill it up to required level but didn't know to use the filter on the hose to help with the iron. To open the pool we were told by the pool guy who was coming to open it for us to use 4 gallons liquid shock (2 one day, 2 the next). He came out on the third day and fired everything up and we then shocked the pool again with 4 lbs of granular shock. Since then we are fighting the free chlorine, just can't get it to a normal level and our total chlorine won't stay at a normal level. Since the opening on May 18th we have gone through 12 gallons liquid shock, a case of granular (Costco brand), 7 lbs pool store brand ulra shock, and 22 lbs Menards brand of shock and still not at the required level!!! We are taking another sample in tonight to see what the levels are but when testing this morning it didn't look good.

Test 1 May 24th:
Free Chlorine: .18 (added 8 lbs shock)
Total Chlorine: 2.44
Combined Chlorine: 2.26
pH: 7.5
Hardness: 156 (added 16 lbs to increase)
Alkalinity: 111
Cyanuric Acid: 9
Copper: .1
Iron: .2
Borate: 9

Test 2 June 2nd:
Free Chlorine: .31 (added 7 lbs)
Total Chlorine: 2.36
Combined Chlorine: 2.05
pH:6.9
Hardness: 190
Alkalinity: 86 (added 17 lbs to increase)
Cyanuric Acid: 26
Copper: .1
Iron: .2
Borate: 11

Test 3 June 7th:
Free Chlorine: .4 (added 10 lbs)
Total Chlorine: 3.18
Combined Chlorine: 2.78
pH: 6.6 (added 2 lbs)
Hardness: 166 (added 12 lbs)
Alkalinity: 99 (added 11 lbs)
Cyanuric Acid: 63
Copper: .2
Iron: .2
Borate: 20
--Also added a iron reducer and stabalizer.--

We are at a loss and it is getting REALLY expensive!! Do we simply just keep shocking it every night?