Hello Najib, thanks for the questions, answers below...shoot any question you have further down the road, open a thread on it when you start, will help many more people again.
Hi Luc... just few queries and i will come back for more... i have a 7400g (aprox) pond build coming up so need ur help...
- 1) Not sure u mentioned it... what kind of bog plants u used?
Don't know specific names for all of them. For sure there's Umbrella Plant, Papyrus Plant, Lotus..there's a couple of other species, but forgive me for not being very knowledgeable on it.
I choose the plants purely on size and speed of growth as I needed filtration big time and fast without breaking the bank.
So fairly common and easy to get, cheap plants.
- 2) The pump u used... submersible? and GPH?
Pump is submersed in the grey settling-tanks on both sides of the pond.
They are rated at 12,000 L/Hr each.
So in theory I turn over my pond about 1x per 2 hours, but with friction-loss and everything from the bogs, I think it will be closer to every 3 to 4 hours.
I could increase that with more pumps, but right now, water is crystal, so there's no need for it.
- 3) The bottom drain... I have ordered pond liner... so not sure about cutting the hole in it....
That's the potential heart-attack moment...lol... I had the same feeling on it.
If you go with a professional 'bottom-drain', then you'll find it's a "was that all?" when you finished it.
Goes against your feeling, but follow the instructions and it's literally a piece of cake.
You could skip the drain and have a deepest point for the pump, with the hose snaking up under some rocks and stones.
I wanted everything out of the pond itself, hence the need for the bottom-drain.
Appreciate ur answers buddy... and of course the updates from you is a treat to watch... i hope to see Mr. T in person, as most likely i may visit Thai in Jan or something... cheers

More than welcome, look forward to having my first 'International visitors' checking out Mr. T and his home.
Cheers,
Luc