Hi,
Been reading the forum a bit more now.
The following question rose to my mind.
Wouldn't testing these 4 parameters suffice (for my pool).
My pool being plastic above ground, outdoors and no splashing, pH elevating fountains or such.
CYA: test CYA to reach optimum level.
pH: test the pH and correct pH with hydrochloric acid or sodium bicarbonate when necessary.
FC: test FC and correct with bleach.
TA: test and correct with sodium bicarbonate.
The amounts of HCl, NaCO3, trichlor and bleach needed will be calculated with pool calculator.
'Correct' me if i'm wrong,
Tim