I have seen numerous water filters in all if the big stores but do not have a clue as to what is required . Can anyone recommend a good water filter for my house and give me some tips ?

Go to HomePro and get yourself a reverse osmosis filter. They are about 9,000 baht. They consist of 5 filters, a 10 micron, 2 carbon, a reverse osmosis and after taste filter. They also have fitters who will install it for you.

What type of filter are you talking about?

An under-counter kitchen one for drinking water, or a whole-house filter into a storage tank?

If Bangkok no filter should be required for more than taste if using treated water.

A filter for drinking water and washing food etc ....that's what i need ..

In Bangkok with treated water something like this at 959 baht is all you should need

http://www.lazada.co.th/clarte-2-wp121cpr-230451.html