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crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Connor
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| [title] Rub the PVC pipe with Sandpaper | |
| - | [* black] Get a PVC pipe with a small diameter |
| + | [* black] Get a PVC pipe with a small diameter; less than 5 cm is ideal. |
| [* black] Rub the outer surface of the PVC pipe with 120 grit sandpaper to create a rough surface. | |
| - | [* icon_note] You will want the surface to go from feeling smooth, to feeling grainy. |
| + | [* icon_note] You will want the surface to go from feeling smooth, to feeling grainy. The goal is to create as much surface area as possible for good bacteria to colonize. |