Hi all thanks for any help in advance. Just purchased a home with a built in masonary pool I estimate 30-35k gal. The masonary in the pool is dark. not black or brown, hard to descrobe. The water itsel is very clear. I tried scrubbing sections to no avail. Does it need to be drained and painted? Also I have a heyward DI filter that I believe I will replace in the spring. It is (I believe) about 15 years old and has several minor leaks around the tank and pump. My other question is I have a light tan colored silt on the bottom of the pool is this from the filter?