That will keep your TA higher where it's supposed to be to stabilize the pH, but each time you add dichlor, you are adding both free chlorine (FC) and cyanuric acid (CYA). Eventually, your CYA will be too high and you'll need more FC to maintain sanitation. This will work for a short time, but after a while you'll need to drain and refill to eliminate the high CYA levels.
In your volume spa, 8 grams of dichlor will raise your FC by 4.9 ppm, CYA by 4.5 ppm and lower pH by about 0.19. After 30 days if you add 8 grams every day, your CYA will be at 135 ppm. After 60 days, 270 ppm. So your spa would likely start to get cloudy, unable maintain adequate chlorine some day after 1 month of this type of daily addition. Your TA will also be dropping down because of the acidic dichlor.
What I would do is try to find a source of plain, liquid bleach (sodium hypochlorite) if you can. When you fill the tub with new water, use dichlor for up to 5 days, then only use bleach to sanitize after each soak.