Blue Thumb Bacti-Twist Biological Filter Media Size:1 Cubic Foot If salt crystallizes inside your

If salt crystallizes inside your unit

Transformer sold separately

for Ultima II 4000-30

The billions of pores within the carbon act as hundreds of sponges soaking in many pond pollutants such as tannin

Blue Thumb Bacti-Twist Biological Filter Media Size:1 Cubic Foot If salt crystallizes inside yourThis bio ribbon media from Blue Thumb (formerly Pondbuilder) is spiral shaped, plastic media designed to filter your pond biologically and mechanically. Bacti Twist's large surface area allows pond debris and other waste to accumulate where beneficial bacteria can consume it. This media is easy to clean and can last for years.