Any one use growmore seaweed extract?

does any one use it and do they find it extremely acidic, i had to use 18ml of ph up to bring ph up to 6.5. This does not seam right but thought I would ask. Mix was 1.25 oz seaweed to 1 gallon of water.

I make my own seaweed emultion and it has the same effect,super low ph. In the 4's.
I feed it to my garden and some ladies in soil without correcting the ph at all.
I'm no expert but from what I gather the soil is taking one for the team and buffering the ph.