If the TDS level is too high, your new pool chemicals you add on a weekly basis cannot dissolve and treat the water properly. This will lead to algae growth, cloudy water, irritated eyes and skin among other things.
The only solution to a high TDS level is to drain the pool and refill it with fresh water and new chemicals. Every pool should be drained at least once every 4-5 years. If you have lived in your home for 5 years and have NEVER drained your swimming pool, now is the time. Avoid costly summer chemical expenses while trying to combat pool problems that won't go away without draining the pool.
Early spring is the best time to drain your pool because once the temperatures get too hot, we cannot drain a plaster pool or we risk the heat damaging the pool walls. Get your pool drained now so that it will be ready to go when it heats up.