I went a similar route, bleaching dead dry rock from local sellers in a big rubbermaid bin outdoors, following the process BRStv followed. It looks like you're attempting the same process, but it's unclear whether you've followed through with the frequent freshwater changes which need to follow.
If you don't have any live stock yet, and you're still getting nitrate and phosphate off your rock, I'd recommend not bothering with saltwater yet. Make big repeated 100% water changes with dechlorinated freshwater until you don't see nitrates any more. Don't waste saltwater washing the dead matter from rock you've killed off. Keep the lights off, and use freshwater so you can change it far more frequently and far more cheaply. Repeat 100% changes until you are sure the bleach is gone, as wel as the residual nitrates and phosphates initially trapped as dead matter in the porous rock.
If you do have livestock, can you transfer it to a little temporary 40 gallon breeder system, while you wash off the rock more thoroughly? It can become your coral quarantine down the road, too.
Also, from experience, dead rock is more difficult to start with than live rock. Pest algaes can be problematic much faster, without the competition. Once your rock is rinsed of it's residual nutrients, low nutrients will probably be more of a problem than high nutrients, due to a constant battle with pest algae, like I've been battling since I started the tank. So long as one's not losing livestock, it's more ethical though, compared to supporting the destruction of habitat to source liverock, plus the carbon footprint of shipping rock before it dies off. It's not an ethical product when the barrier reef is receding so fast.
