- should I get water sampled and tested independently of treatment system installer ?
yes definitely.
- if so, would anyone have recommendations for labs who do this ?
no sorry,
- any ideas of costs for water testing ?
circa €100 from what ive heard
- would anyone have recommendations for treatment system installers in midlands area ?
i think you could try this guy. He may not do one-offs but he certainly will help you out with info as to what you need.
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- should I get water sampled and tested after treatment installation also ?
yes, definitly
- what kind of guarantees should I look for from treatment system installers ?
That they will be able to get your water cleaner than public council water.