I ordered a Taylor k2006. My pool guy has this kit as well and he did the testing on my water yesterday. Here are the numbers...CH 600, TC 3.0, FC 3.0, pH 7.8, TA 180. He added 1/2 g acid, retested 15 minutes later TA 120 and pH 7.4. I learned that the white flaky scaling floating in the water is most likely coming from the salt cell...that the higher pH levels (he said it has been over 8) make this happen. I let him know how important it is to keep that pH down...anyways, the other problem of the small specks of black algage remains. He brushed it with a wire brush each week but it grows back. The pebble tec doesn't make complete removal easy. So, do you guy think I should go down on scuba, and really scrub the heck out of each spot, then chock with a non cal hypo shock? I want this ba dead! If you think this is a decent idea, is a sodium dichloro shock ok to use? Thanks so much for the help