[nereefpat]

Originally Posted by ptreef

my understanding is that the typical mix of sodium bicarbonate is 50% as potent as soda ash,

Yes that's about right.

So if im dosing 300ml a day of soda ash, i would need to dose around 600ml of sodium bicarbonate....

Yes, if you are using the same weight/volume concentration.

Can you make the sodium bicarbonate mix more concentrated?

Probably. Quite a bit of either can dissolve in a liter of water.
Also I do notice the soda ash mix does over time crust over heaters and sections of sump near where dosed. Nothing crazy...

Is this a greater or lesser issue with sodium bicarbonate??

I don't think it will be much different. You should be adding to a high flow area, and shouldn't see much depositing.