I hope I can get some help on my question but at the very least maybe someone can direct me to a site that can.
This question relates to size of koi pool and fitering system used. We are looking to build a koi pool of about 20,000 litres (about 4400 UK gallons) and I'm trying to wade (no pun intended) through all the different filter systems that are available. I'm not going to ask what the best filter system is (although I'm open to suggestion) I'm just asking how I calculate the filter system size and waste water throughput for a given number of mature koi (say) 40.
I'm also considering running two smaller filters in parallel i.e. operating independently. What are the pros and cons of this?
I hope this is the place to ask these questions and if not please do redirect me elsewhere