Conch? I like conches...
Anyway. You can buy it, I just use generic drug-store brand. Its cheaper, and does the same thing. Or H20cean.
You can put a little bit in a cup, and stick it in the microwave briefly. The warmth is good, and helps draw out lymph and get crusties off more easily.
But I prefer to make my own, its cheaper, and easy.
1/8tsp non-iodised sea salt mixed in a cup of hot water, and leave it to cool for a little while.
It should taste no salter than your tears.
Twice a day, three times at most. If its gets horribly crusty inbetween, mine was, clean it with boiled water.