If you have a CYA of 70, your shock level is 20ppm. (See the Best Guess Chlorine Chart in my signature below.( You are going to have to buy a Taylor K-2006 to be able to measure chlorine readings that are that high.

Your pH must be above 7.0 as any readings below that are acidic and can damage your pool. Add some 20 Mule Team Borax (laundry aisle at Walmart.) Aim for 7.4-7.6.

Also, you don't have any bromine -- this is a chlorine pool.