OK, I went out this morning and tested the water and spent 45 minutes brushing and vacuuming the pool to waste. After that I added 4 chlorine tabs to the skimmer basket and that is it.

During vacuuming I did notice what appears to be yellow masses on the bottom of the pool (yellow algae?) and also around the water level there appears to be a 3 inch band of yellow discoloration.

The following are the ingredients that I have been using

"shock" = Dichlor (58.2%)
algaecide = polyquat (60%)
chlorine tablets = trichloro-s-triazinetrione (94.2%)


Test results:

Free Chlorine 3.8
pH 6.8 (big drop since the 7.6 that I had tested last Saturday)
Alkalinity 50 (it was around this mark that the test water turned from purple to clear with a green tint)
Bromine 4.4

The test kit that I use doesn't give a test for calcium hardness, unless there is a way to tell it from the other results?

Since the pH has dropped so much since Saturday I believe that may the source behind all of this, but it's just that even over the course of the weekend when the levels were perfect there didn't appear to be anything that was removing the algae.

Unfortunately I am working all day and into the night tonight so won't be able to check replies to the thread, but I do have plenty of shock, so if whoever is kind enough (Janet?) to answer this and suggests I add the shock then I can do that thi evening around 1030pm