Hello
Don't put wet wipes down the loo as they don't disintegrate. I believe most are made of cloth fibres. Only put paper down. The colour doesn't matter, but white is usually cheaper. Newspaper even cheaper (if you have read it first)
The sachets to keep the septic alive are called 'Activador Biologico Fosas Septicas Bolsitas soluables' .
Don't go mad with the bleach. A bit wont harm the tank