at least 12 feet
there are many plants in the rock pools i can name at least two right noww hair moss seaweed
Not that I have heard of at least not in the concentrations normally used in swimming pools
Swimming pools go back as far as 2,500 BC exact dates are a little hard to determine as the council records from those days are a little vague to say the least.
Our pool supplier said at least 5 years, usually more.
about every 3 months you need to add at least 1 bag of salt.
Well, yes and no. You do have to clean it and keep the water maintained, and it can end up costing a lot sometimes (at least mine did). But pools are nice to have! If you can keep up with cleaning the water then no; pools aren't hard to deal with.
Ring Clark rubber and ask
In ground swimming pools are usually bigger than above ground pools. Although rather more expensive, in ground pools will last longer than above ground pools.
Ball Pools
If we could find a name, you wouldn't recognize it anyway. The best answer is that pools were probably developed as soon as somebody learned how to collect water in an artificial basin. The answer has been lost in time.Swimming pool go back at least to Roman times Pre 2,000 years many of them were even heated.
Springs or pools in the desert are oases.