Thanks all, Have been maintaining this with the new bakki type shower and believe me it is no chore at all. Nice and easy. Minimum water changes. Suck up the dirt every 3 months.
The Pond are still stocked with the 12 Asian Arowanas and they are getting bigger and hungrier each day... lol.
This have been a pleasure keeping the pond in condition, did not have any outbreak of any kind except the beginning with some parasites when using the first in pond traditional filter system. Really enjoyed them this several years since then.
Thanks for all your nice, encouraging comments and feedback.
Cheers.