Adjust your pH first: 8.2 is high for a spa, get it down to 7.2 by adding the specified amount of dry acid per PoolMath using your spa capacity and the other numbers. Any pH reducer (most cases dry acid or muriatic acid) will also drop your TA, which is expected and desired when your TA is 150. You want your TA to sit at the lower end of 50-80, preferably 50, which will be accomplished by adding dry acid regularly. When using the spa, you will be adding dry acid regularly, because you'll see that your pH drifts upward the longer you have your jets on.
Also, the higher your TA, the faster your pH will rise. TA is basically a measure of dissolved baking soda (carbonic acid), and aeration offgasses the carbonic acid, causing increased pH. However, by adding acid to lower you pH, you will also drop TA at the same time, and can accidentally drop your TA below 50, so test every 6 hours and if your TA goes below 30, add enough baking soda (aka Alk-Up) to hit 50 per PoolMath.
When you get your pH down to 7.2 and TA down to 50, add 50ppm borates per the PoolMath amount of 100% boric acid (e.g. SpaGuard Optimizer) to "lock in" your pH, meaning the borates will act as a pH buffer and will greatly slow your pH rise from aeration. The borates help you use less pH reducer (aka acid) per time unit of aeration to maintain pH in the normal range of 7.2-7.6. Don't add acid unless your pH hits 7.9 or higher, and when that happens, shoot for 7.6 as the corrective amount of acid per PoolMath. With 50ppm borates, you'll see that your pH tends to stay in the 7.6-7.8 range for a long time before going higher, whereas without borates, your pH will go to 7.9-8.2 a lot faster, pretty much after every session.
From a fresh fill, you always want to maintain an FC level of at least 3ppm absolute minimum to inhibit bacteria growth, but you can shoot for 6-10ppm as the daily amount. Use the bottom part of PoolMath (where you can enter any amount of any substance) to tell you how much diclor you need to reach 20ppm CYA given your spa capacity, should be in the 60-70g ballpark depending on spa capacity.
When you've added enough dichlor to reach 20ppm CYA, then it's easy flying from there: switch to pool chlorine to maintain your daily FC level, add dry acid whenever your pH hits 7.9, and "shock" to 10ppm FC weekly or after heavy bather load. After 3-4 months, purge with Ahhsome and do it all over again. Don't forget to scrub behind those Bullfrog JetPaks with Ahhsome+superchlorinated water!
