Building a diy upflow filter for the koi pond to collect small fines
Acrylic tube -
http://clearplastictube.co.uk/Polycarbonate-Tube?gclid=EAIaIQobChMIn4e9xbjp8AIVErvVCh1DVQYMEAAYAiAAEgLLEPD_BwE
John guest fittings and tube -
https://www.osmotics.co.uk/catalogsearch/result/?q=1%2F2
Thank you all for watching