from https://brewtogether.com/2019/10/05/homebrewed-cider/:

-Add the 4 gallons of pasteurized apple cider or juice and 2 containers of the guava nectar to a sanitized carboy.
Pitch the yeast according to the instructions on the packet.
Ferment for approximately 21 days. Fermentation will be rapid for a few days and then slow for a couple of weeks. Ferment completely dry.

-Once fermentation has stopped and you have taken a gravity reading to make sure it’s done, you’re ready to keg the cider (if you don’t keg, jump down a few paragraphs to the bottling instructions).

-Rack from carboy into cleaned/sanitized keg.

-Add 1/4 tsp to 1/2 tsp of Potassium Metabisilfite to the keg. Purge the headspace from the keg with Co2 and cold crash.

-Wait 24 hours.

-After 24 hours, add 2.5 tsp of Potassium Sorbate. You need to wait the 24 hours so that you have some sulfite in the cider before you add the sorbates or you will end up with some off flavors. Purge the headspace in the keg a couple of times with Co2 and cold crash.

-Wait 3 days.

-After 3 days, backsweeten with 1-2 containers of thawed frozen apple juice concentrate (to taste) and 2 containers of the Goya Guava Nectar.

-Seal and purge the airspace in the keg, then put it under pressure to begin carbonation. I just carbonated it slowly at about 10-12 psi, which worked perfectly for it.

-It’s drinkable pretty much immediately, but if you can wait 3-4 weeks it will improve substantially in flavor. You may have sediment settle at the bottom of your keg. If you find the first pint is a slushy ugly pink mess, pull another pint or two before worrying too much – I had to pull about 20 oz before it got to the good stuff.

-Enjoy