So If I soaked the rockwool in 5.5 PH water for 3 days... The PH of the water would still be 5.5 at the third day? Or would it raise/drop

I found rockwool for 10 cents per 1.5x1.5x1.5" cubes, and a dollar for 3"x3"x4" blocks.
that doesn't seem too overpriced to me...

I was just worried about the PH fluctuations...

For the Rockwool Growers::
Would you STILL recommend using a rapid rooter or oasis cube?