Need help with diy 2 part. Also has anyone had success with this?

[ReefMadness]

i've never tried Randy's recipe or any diy's but as another option consider aquaforest dosing salts, they're dirt cheap if you opt for the dry elements as opposed to the pre-mixes. i make 5L batches and bet you could get close to 10 batches from each container. even at your consumption rate they'd still last quite a while.