I have read in books and heard on TV that CPVC should be used for the supply line for the water from the meter to the building. I have also been told in a store that PVC would be fine.

I am in Zone 8 in TX incase this makes any difference.

Questions
What is the differance between CPVC and PVC?
What is the pros and cons of using PVC as the supply line?

Any help in clearing this up for me will be greatly appreciated.

One of the differences is you need a cleaner and glue for PVC while you only *need* glue for the CPVC. Most modular homes who don't use PEX will use CPVC because its quicker than PVC. PVC is also alittle bigger than CPVC with the same size. As in 3/4" PVC is bigger than 3/4" CPVC.

If you are running a line underground, you are better off not using a rigid pipe like PVC and CPVC.

So the only difference is the cleaner for putting the pipes together. So there is not any sanitary, strength, or longevity differences to take into consideration?

Also, this is going underground, heavy clay soil, about 175 ft from meter to barn. So what do you recomend to use if not CPVC or PVC? And why?

CPVC has a higher temperature rating than regular PVC. It's recommended use is for hot and cold water lines inside a house. PVC won't work for hot water lines.

CPVC and regular PVC are rigid pipes and can be rather brittle and susceptible to damage with direct burial. Look for CPVC with a NSF-pw rating (I think that's National Sanitation Foundation, potable water. Cheaper gray color cpvc is not for potable water) If the ground shifts or the pipe gets poked with a shovel, it may splinter and burst more easily. A big drawback is it comes in 10 foot lengths, your going to need a bunch of couplings glued underground and buried for that distance.

Consider polyethelene (I think it's called Polyethelene, black color, flexible). I think that's the pipe underground sprinkler guys use. Find a Tractor Supply Store or plumbing supply house and buy a roll of the PE. I think it comes in at least 100 foot lengths. Well companies use it and it's alot cheaper than copper. Get the proper couplings and your in business.

I don't know the volume your after, but probably 1" line for that distance. You'll get some pressure loss.

Just a thought, maybe you could hire an underground sprinkler guy to come out and run one pipe from here to there with his trencher. I'm not sure how deep you need, if freezing is a danger in your part of TX, or if you need water to the barn year round.

Hope this helps some.

You need to check with the local building official. Some areas do not allow PVC at all except for drainage. Your local code will determine what type of plastic pipe you can use. The recent understanding is that some of these plastic pipes can release harmfull chemicals in the water,