I am assigned to help with two newly constructed ponds. I am not an expert but previously had a 10,000 gallon pound in the past when i lived in California(designed by experts). Since the owner with the two ponds did not give filtration a thought, he asked for my advice knowing i know slightly more than he does.
Pond 1: 25,000 gallons, 3 sets of waterfalls needed, has a bottom drain 200mm, circulating pipe work, and a separate location for a skimmer i suppose. The drain is connected to the deep skimmer chamber.
Pond 2: 18,000 gallons, Large Waterfall, multi-level. Has circulating pipework, not sure if a bottom drain is in place. Also has a separate chamber for pumps/filters
Scenario: These ponds are at the same backyard in Shanghai, China. The shape was decided by the owner, the rest was left to the landscaping people. I have spoke with the designer and he wants to use sand filtration similar to pool designs. I am a bit uncomfortable with this design, please give your inputs.
Designer wants to put in: (pond 1)
3 900 watt pump
1 280 watt
2 sand filters
5 uv lights
2 900watt pump
1 3000 watt pump to power waterfall
1 sand filter
3 uv lights
Using his design it seems the electricity bill will be extremely high and the results may not be so great.
I have done some research and it seems the new bead type filters are not available here. The pressure filters for small to medium ponds are available but probably not practical in these large ponds. Gravity filters (non-pressure) is available but will require separate pumps for waterfalls). Another option is a custom built DIY filtration chamber (but I am not an expert on this and have not done one before).
I have also consulted with pond experts here. They suggest building/digging filtration chambers (custom built) using their filters/design. This is with a 750 watt pump for drainage, 3 sets of power conserving 300 watt pump for filters and waterfalls. This all sounds good but the price is a bit high at approximately $8000 USD for 1 system (two ponds is 16k!)
If any has suggestions as to
1. Go with Pool system
2. Go with gravity filtration (cheaper) and separate waterfull pumps (not always on)
3. Go with the expensive expert solution
look forward to your inputs!
First 4 pictures are of pond 1 (larger pond, 25k gallons)
Last 4 pictures are of pond 2 (large waterfall, 18k gallons)