Hello, how can I recognize reliable sellers?

Hi. I'm new. I've wanted to elaborate MMS1 since a long time ago. But I want to buy a lot from the beginning and I don't know how can I recognize a reliable seller, if there are tips to do it. I'm thinking in one of these products from a reliable regional sales website. All thesellers have the highest reputation. But after all all they send you is white powder. How reliable is this? Is it common to sell fake cloride or acids?

2 kilos: articulo.mercadolibre.com.mx/MLM-587848306-clorito-de-sodio-y-acido-citrico-paq-2-kilos-1-k-de-cu-_JM?quantity=1
1 kilo: articulo.mercadolibre.com.mx/MLM-568800854-clorito-de-sodio-al-80-para-prepararlo-28-acido-citrico-_JM?quantity=1
1 kilo: articulo.mercadolibre.com.mx/MLM-671027353-1-kg-clorito-de-sodio-al-80-y-1-kg-de-acido-citrico-_JM?quantity=1
1 kilo: articulo.mercadolibre.com.mx/MLM-640392769-1-kg-de-clorito-de-sodio-y-1-kg-de-acido-citrico-para-mms-_JM?quantity=1

I see others selling small bottles with the chloride and the activaror. These I have seen everywhere but are much more expensive. articulo.mercadolibre.com.mx/MLM-572231043-mms-clorito-de-sodio-y-activador-de-120-ml-cu-dioxido-_JM?quantity=1#reco_item_pos=0&reco_backend=machinalis-seller-items&reco_backend_type=low_level&reco_client=vip-seller_items-above&reco_id=0327523d-5f4a-411e-9d23-fa40f276ea8a

IslandEternal asked: "Is it common to sell fake cloride or acids?"

Have never heard of a seller of MMS products selling "fake" products. It is too easy to check a dose of MMS1 just by the color of the solution at 30 to 60 seconds of activation time. See this video to see what a 3 drop MMS1 dose looks like. And of course, there would be the odor of CLO2 gas when MMS1 is made in an open-top container.