No sure what pH-Plus is. Is it Sodium Carbonate--soda ash? If it is, then Arm&Hammer Washing Soda is the same thing and probably 1/3 the price.
What lowers T/A is lowering the pH, not the aeration. The aeration RAISES pH but does it without raising T/A at the same time, unlike Sodium Carbonate or even Borax.
So you LOWER pH to bring T/A down with it (T/A moves with pH).
Then you aerate to RAISE pH again with increasing T/A.
Then you lower pH again, bring T/A down again.
Then aerate.
Keep doing this till your T/A is where you want it, then stop.
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