I have 3 year old, 50 x 16 deck made of pressure treated wood. I am not sure what kind of wood but it is from Lowes. When I cleaned it last year I used bleach (big mistake) and a power sprayer and sealed it with Thompson's. Now it is covered in splinters. You have to wear shoes to protect your feet. Other than sanding, is there anything else I can do? The boards are not level enough for a good sanding job.