Well, we do but it's a concrete deposit up on a tower, we use that for watering the garden.
Basically the water has a lot of iron in it, you don't really notice it when you're watering from a hose, but when we tried to use it to fill the pool it was green! It also smells metallic.
I've spoken to two local guys about it. One is our electrician who set up the automatic surface pump (you turn on any tap and the furo pump comes on automatically, it's great actually), all he would say is that we're too close to the Tejo and the water round here is no good. Which I think means he doesn't know but doesn't want to admit it.
The other guy was our pool guy, who thinks himself a bit of a water specialist. From what I could make of his explanation, he would install a 2000L plastic tank, a sand filter, and then some other sort of filter that would treat the water in some way, I couldn't totally understand what he was describing. It all sounded expensive (ie, not hundreds), but then if it saves us €1200 a year it has to be a good investment. I asked him for a quote, but that was about 6 weeks ago and how he seems to have disappeared off the planet.
We do have the furo water piped to the house, so I could switch off the mains and switch on the furo. And then we drink bottled water. But with small children in the house, having baths etc, I don't want to take any risks.
I think as Lobito says get the water analysed and see how bad it actually is.
Okay that'e enough. Time for a beer!