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One more question though. How do I add liquid Murcia acid ? What I have done was get a bucket of the water from pool and add acid to that and pool that mixture around the pool ? Or do I just pour that directly to the pool ? And my pool is kind of spill over from spa. And main return are from the spa. So should I just pour acid directly to that middle of the spa ?Your CH is in a good range. Your TA is not that bad either at 100, although you could lower it a little more (i.e. 60-70) by following the TFP Pool School - Lower Total Alkalinity page. Lowering the TA a little might help keep the pH from rising too fast. Most important right now is keeping the pH below 7.8. Ideal pH would be right around 7.5-7.6. Remember that pH has a tendency to rise in new pools (new plaster), pools with high TA levels, and aeration. If your spa has a spillover and runs a lot, you might consider reducing the amount of time the spa spills-over. Not sure why your pH decide to climb recently, but continue to watch the pH carefully and consistently to ensure pH stays below 7.8 and you should do fine with calcium/scale control.
You can pour acid directly to the pool. Always best to do it with the pump on high to ensure good water movement as you "slowly" pour the MA near a return jet(s). Be aware of the wind direction to avoid fumes to the nose & eyes. Not so sure I'd pour into the spa (shallow) or try to get too close to the spillover since you don't want the MA to have any chance of splashing back onto you. Usually we're only talking about a cup or two of acid at a time, so if you have no returns at all (other than the spillover) maybe pour slowly in the deep end and brush that area right away to ensure the acid is diluted and moved around. Regardless of which method you end-up trying, the key points are avoiding fumes/direct skin contact, and not letting the acid accumulate in any one area out of concern for the pool surface. Once the acid gets moving in the water though, you're in good shape.