Hi again from Piemonte (northwest part of Italy where putting in a swimming pool is, to say the least, Byzantine)

Can anybody direct me to a site that explains what the essentials of pool plumbing are? How to know what the necessary equipment is for a regular back garden pool with one side only tipping over into a deck level canal to a compensation tank? I would like to use a SWCG to purify the water; don't want to heat it; would like the water be pushed up from the bottom rather than sucked down.

It's like learning Greek here. Thanks for any advice.

Best regards,
Jane