GFO questions

So, just started running GFO in a BRS reactor and, upon the advice of some members, I only started with half of the amount that they call for on the label (1 Tbsp per 8 gal instead of 1 per 4 gal). First off, this doesn't really seem like very much (have about 36-40 gal total volume so added about 4 1/2 Tbsp). Would I run this amount until it's time to change the GFO and then go to requested dosage or should I gradually add every change out?

 

I would do it gradually and keep an eye on Alk.You may not even need more.

 

Thanks Vinny! Wasn't aware Alk dropped with GFO. So if the buffer drops then will the ph take a big nose dive? Just started really testing for alk and cal but the gha was becoming a problem.

 

Phosphate removers can sometimes cause a decline in Alk.
You will want to test Mag. too this is probably the most important when dosing the tank.

 

As usual, thanks again for the great advice Vinny!

 

Thats still way too much. For some reason known only to them, BRS recommends twice as much or more than ANY other vendor, many with a lot more experience than them.
TLF and most others say 10 grams or 1 spoon per 10 gallons full dosage and half that or less to start with.

I like BRS chemicals but I don't care for their instructions on many things they sell.