Fishing Green River Lake

What is the best fishing line?
I fish in the southeast to north London. I go to the channel of the river Lea in case of flooding, the read channel and several lakes in Epping Forest. They are all different. Some are very clear and some, such as flood relief channel are a bit of color. Is there a line that is suitable for all occasions? Some I have seen are green, brown and I've even seen a red fish with a line one.I only 4 pounds, but today the reels are diameter as well. What to do, etc would be better?
Fluorocarbon has become a main line for fishing, especially in suits to face the light. Fluorocarbon is more resistant than monofilament and has better abrasion resistance. The main benefit is the refractive index of light that is virtually invisible in water. Use of lightweight equipment is better with a line style mono, it can become small braids and twist easily. The fluorocarbon take place in a situation of many and is definitely better for clean water / Clear.
Green River Lake, Central Kentucky