My sand filter sometimes start leaking and sprays water from the top. After many tries I have replaced the O-ring used the proper silicon-based lubricant and I guess my real question is how tight does one tighten the clamp ring. Also any other pointers would be appreciated. It seems to do well for about 3 to 4 days then once again starts leaking and spraying water. The pics show how much I tighten the clamp. Thanks