Pond questions

Get an EPDM rubber liner of at least 45 mil thickness. Other liner types, especially PVC, break down quickly, and thinner liners are more likely to be punctured.
 
Should I go with the EPDM linear or one of those hard linear insert ponds? I saw one the other day at Home Depot thats a 125g pond and I believe it was 3 1/2' deep. Would that work or would linear be best?

Also what should I do for a filter? Don't really want something sitting in the middle of the pond doing a water feature. We are maybe thinking of putting a little pump in it to have a figure squirt the water in the pond, but what should we do for a main filter?

Another question I have is, if I go with the insert kind pond do I drill a hole in that for the filter or just put PVC laying on the ground and have it go into the pond like that? Same question with the EPDM linear.
 
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