We just refilled our pool after getting a brand new vinyl liner. Everything was good, ph 7.5 and alk was 100. While filling the pool I added 32 oz bottle of Jacks Magic Stufffor vinyl liners metal stain preventer and we used a filter on the hose. We did those extra steps because we fill from well water though we've never had problems. I tested again several hours later and ph was 7.8 so I added a small amount of ph reducer which brought it back to 7.5. Also, pollen had fallen in the water created a slight green color in the deep end. We are filtering and running Polaris, back washed three times trying to get the algae from the pollen out. Test again...ph 7.2 and alk now 90. No chlorine yet because the tabs take time so I added less than a lb of chlorine granules and my pool water immediately turned deep black! Help!! We just paid $6,000 for this liner...will it be ruined? I'll go to pool store tomorrow but those guys are hit or miss. Can anyone here help? I don't think there would be metals in the water as we took precautions, have no heater hooked up but that Jacks blue stuff....could that have done something. Omg. Any help is greatly appreciated.