The Swamp

We physically opened the pool last Thursday but there was some cleaning to start with and we let the pool robot do its thing Yesterday it was ready for chemicals. The pool started out brown and swampish. But after 12 gallons of chlorine, pH increaser, shock and whatever else it's now green and you can see the bottom in most of the pool!

I keep testing the water between gallons of chlorine and it keeps indicatiing its low..what to do? Do I stop now or keep adding til the stick is lavender?

Here's some pictures of the swamp and ouur chlorine tablet shark