What is the best maintenance for my ponds please

[Invicta]

This might be "how long is a piece of string" so please excuse my ignorance.

I have just started to take care of a set of ornamental ponds, no fish or aquatic plants are involved.
The "system" consists of.
2 x Bubbling fountains.
1 Round pond about 3 meters in diameter and 1 metre deep which has a fountain and 4 lips around the edge which act as miniature waterfalls.
I have lifted various inspection covers and found.
Bubbling fountain = Ball cock and OASE Living Water Nautilus 200 pump
Round Pond = OASE pump with a small fountain attached, an outlet pipe which goes via another OASE pump to a Filtoclear 1100 which appears top have an Ultraviolet(?) light in it as well as foam filters in the "dustbin" type body.
There is also a pump and a ballcock down inside what appears to be a converted septic tank which supplies water to the waterfalls in the fountain.

I hope the photos help explain what I mean by bubbling fountains and round pool?

I have cleared away some dead leaves and brushed off sediment from filters etc.

I was wondering what kind of regular maintenance I should be doing throughout the year?

Any help will be very much appreciated as I am very new to all this,
Thanks for looking,
Bernard

 

[pecan]

Very cool ponds!

Any fish?

And the piece of string is 47 feet 8 inches long It's a long string!

Welcome!

 

[sissy]

You can use peroxide to kill bacteria and keep water from getting green .

 

[Meyer Jordan]

Being that these are strictly formal decorative features not supporting any life, simple chlorine tabs such as those used in swimming pools will keep the water clear.

ww.walmart.com/c/kp/swimming-pool-chlorine-tablets

 

[sissy]

true but some don't like the smell of them so I guess it will be up to you to see what you like .

 

[Invicta]

My thanks for all these replies.
There are no fish or aquatic plants in the pools at the moment and I have no plans to add any.
I wondered if Chlorine tablets might help but was not sure if they would damage the pumps in any way. I assume I just use a small amount as a) It keeps the smell of chlorine to a minimum and B) Stops the pools turning into "bubble baths".
Thnak you for all the help,
Bernard

 

[Invicta]

I was told this series of pools was serviced just last week.
No wonder I was tasked with getting things sorted!

The main pool was the colour of pea soup when I arrived.
Work I have done so far includes:
Replaced 2 broken pumps and an ultraviolet bulb. Fixed 2 broken pipes/hoses and a jammed ballcock and removed and cleaned the fountain head.

Thank you all once again for your advice,
Bern

 

[NorthernIndiana]

You can use peroxide to kill bacteria and keep water from getting green .

Can you use peroxide if there are plants and fish in the pond?

 

[sissy]

I do and never had a problem as long as you don't add to much .I usually turn off my pumps and use 1 /16 ounce bottle and add it to my waterfall pond first and then squirt the rest around the pond .I leave my aerator on and wait 15 or 20 minutes and turn pumps back on.A sunny day works the best .