Nitrate too high, do i really have to refill the pool???

[simpleton]

Just got the pool opened up recently.
Got our Chlorine up. Went to the store for a full test.
They said our Nitrate was too high (29ppm), and we needed to dump/refill the pool by 1/2 or 1/3.

I don't think we had this issue last year.
We did use Phos-Free a few times last year to clean the pool.
To start off this year, we only added a little water from our well.
And we didn't do any kind of "Spring-Startup" kits or anything.
I don't know why it's done this. There is a nearby farm, but it's always been there.

Do we need to dump 1/2 or 1/3 of the water? Sounds kinda crazy.
We have the test-kit recommended from the site here, but it doesn't include Nitrate.

Here's what our "In-Store" test showed:

Free Chlorine: 2.7 ppm
Total Chlorine: 3.0 ppm
Combined Chlorine: 0.3 ppm
pH: 7.5
Hardness: 300 ppm
Alk: 56 ppm
CYA: 15 ppm
Copper: 0.1 ppm
Iron: 0 ppm
Nitrate: 29 ppm

Is this something serious? Do we need to dump/refresh our water?
I'm pretty freaked out. I would appreciate any advice.

 

[JasonLion]

If you can maintain a reasonable FC level, without constantly losing all your FC, then there is nothing to worry about and no need to do anything. Your CYA level is fairly low, so I would expect you to lose a lot of FC during the day. The important question is if you lose FC overnight. If FC remains steady overnight then you don't need to replace any water.