I am new to this forum and am so grateful to have found it. We bought a house this past October. We have never owned a pool before. My questions is this. If we have been using granular chlorine and tablets, is it okay to start the BBB method or will I screw up our pool? We have a 20 x40 in ground pool, 35, 000 gallons and vinyl liner. I have ordered one of the test kits recommended here but have not received it yet. We have had trouble maintaining chlorine and pH has been consistently low below 6.8. Water has been dull and cloudy. I really just want to know if we can start using BBB method even though we didn't open the pool this way? Thanks.