Buy a packet of disposable tea filter bags from a tea shop or grocery store. Use one when you’re preparing especially fine tea which tends to slip through mesh strainers easily. Keep the bag upright with the opening well above the water level so the tea leaves don’t float out. You can also use a filter bag if you just want to make 1 cup at a time with easy cleanup. Metal tea balls and silicone tea strainers are popular since they come in playful designs, but keep in mind the limited practicality of these tools. Refrain from using them for large-leafed tea as they won’t leave much room for the leaves to unfurl as they become hydrated. Additionally, avoid using a tea ball or infuser for fine, powdery teas as the tea leaves may slip through the holes easily.  If you’re steeping medium-sized tea leaves in small quantities of water, a tea ball or infuser might not pose any problems. Hinged tea balls are difficult to fill and the mechanisms can be tricky to open and close, especially when the metal is hot.

TL;DR in Indonesian:
Pilih kantong penyaring teh sekali pakai untuk daun teh yang berukuran sangat kecil dan halus. Hindari menggunakan saringan teh berbentuk bola untuk daun teh berukuran besar atau sangat kecil.