Simply pour equal amounts of fixer and developer into the ChemPro container. Because the patented polymer is highly absorbent, the container may be filled a little at a time over many months. This means it is not necessary to stage or store chemicals separately. Once full, tighten the lid and place in your regular trash. Equal parts of fixer and developer are needed to create a neutral pH; a neutral pH is required for proper treatment and solidification to occur.