Be sure to follow the builder's instructions on maintenance during the first 6-8 weeks that the pool is curing ( you said similar to pebble-tec). pH may well rise constantly, requiring additions of muriatc acid. You may also need to maintain calcium levels in the water as instructed. Ironically, new concrete pools may do well with tri-chlor tabs as they add acid and stabilizer (CYA) as well as chlorine.