Cover for small swimming pool water storage

I have 4 small swimming pools as rain water storage.
They are cheap plastic 10ft x 30" things that cost about C$200 & hold about 5000 liters each.
My first one was assembled in Feb 2020 & is holding up very well.
I cover them with black plastic tarps to keep debris & mosquitos out & reduce algae growth.
The problem is that the tarps break down & shed plastic into my water & the environment.
Does anyone have any suggestions for what material is either natural or wont break down, that I could use to cover the talnks ?
Thanks

Maybe billboard covers.

At Wheaton Labs and other folks on the forum use them for a lot of different applications.

I am not sure if cotton duck is available at a decent price.

Old sailboat sails.

Our wonderful sun degrades everything over time. So you just need something that will last without breaking the budget. Have you tried vinal like the pools are made from?

I have a "shed" that is really just a tarp stretched over a frame to keep some stuff dry over the winter. I used to just pack the tarp away in the summer so it would last longer. But this year I am going to cover the tarp shed with a layer made of our old curtains to block the sun. That way I won't have to break down the shed needlessly and then I can just store the fabric in the shed over the winter.

Larry, I like your idea of using pool material, but it will have to wait until one of my pools breaks.
I'm very impressed with their durability so far.
I'm on Vancouver Island & they stay out all year & half full over winter.

How about widow screen netting?
That would keep out the mosquitos and the debris.

Dan's idea of protecting the plastic should also work.
Burlap or some other natural fiber as a sacrificial layer would be ideal.

I am always inclined to over complicate things, so let me suggest supporting the plastic from beneath covering it with cloth or netting and adding soil and seed.
Alternatively,  parge the netting with cement for a very durable covering.

I read somewhere of people making dome shaped covers for rainwater tanks out of Latexcrete.

A picture of the type of pool you're talking about would help. You might have to use something - possibly as simple as recycling pallets, to reinforce the edge of the pool, but it was implied that the latexcrete was quite light weight. Of course one person's idea of "light weight" and mine, are often very different. (I'm on the small size of the human "average"!)

This fellow uses old bed-sheets to make a water proof tarp, but Hubby is concerned about the fire/fume hazard involved in this technique, so we haven't tried it either. If you decide to try it, I would stitch the bed-sheets together into the shape you want, and then treat them. If you sewed casings into the sheet, you might be able to slide ribs in afterwards to hold it up off the water.

Holy crap folks! After trying my best to throw out a good idea about a swimming pool cover for someone else, I just scored a 13,000 gallon doughboy for 200 bucks! Won't do me any good this year but Summer '25 is going to be a lot greener around here.