Apart from a well-lit work-surface, the equipment, tools and resources for building a ‘Dynamic Fermenter’ are available from DiY and other stores or online.
It is best probably to set at least two days by for construction once the items listed have been collected.
Basic equipment includes:
1 – A short length (eg 60-70cm) of high quality semi rigid plastic tubing of the correct dimensions
Blue ‘Top up Hose’ has been the choice for the pilot; it is sold in camping shops for transferring water at campsites, comes in short lengths (eg 1m) and has a bore of 13mm (external diameter 17mm), giving it a wall thickness of 2mm (which makes for a good tight fit for the 15mm spigot generally supplied with drinks dispensers). This however is not ‘Food Grade’ plastic but a compromise until something better comes along. Some camping stores sell this loose; if buying this way check the wall thickness is no greater than 2mm. – any thicker and it will not be easy to see the liquid level inside the tube.
2 – A medium size glass drinks dispenser (eg 7.5 litre capacity)
Drinks dispensers come in many shapes and sizes; the design shown here (picture on the left) was the one used for the pilot project as the most useful.
Apart from hand tools such as a sharp craft knife you will also need:
- Washers to fit spigot (not strictly necessary)
- Plastic 19mm Bulkhead fitting
- 100ml measuring cylinder – Brewing department of larger stores.
- Beeswax – Beeswax either rubbed directly onto screwthread section of the spigot or dressed onto a strip of cheesecloth. (alternatively, plumbers’ PTFE tape will do the same job)
- One or two Cork floor tiles (your local DiY store)
- A permanent marker for adding details on pots used to store yogurt
- A hardback log book or dedicated diary for keeping notes
- A small improvised stage to raise your ‘Dynamic Fermenter’ and allow room for a pot to catch the harvest of raw yogurt
- Small clean, dry glass or transparent plastic pots with lids (ex houmous pots are useful).
The Guide section then gives a step by step account of how to fit these together securely (pages 4 onwards); it requires patience, a little skill and a few extras. It is probably best to allow a couple of days unless you are particularly skilled.