How to Recycle and Reclaim Clay

Every potter, no matter how experienced, ends up with scraps. A trimmed foot ring here, a collapsed wall there, a mug handle that simply refused to cooperate. If you are just starting out, it can feel genuinely disheartening to watch what seems like good clay heading towards the bin. The good news is that unfired clay — whether bone dry or leather hard — is almost entirely recyclable. With a little patience and the right approach, you can bring it back to a workable, smooth, beautifully plastic state. Nothing goes to waste, your costs stay low, and you develop a far deeper understanding of clay in the process.

This guide walks you through everything you need to know about recycling and reclaiming clay as a beginner potter in the UK. Whether you are working from a shed in Sheffield, a spare room in Swansea, or a shared studio in Bristol, these techniques are accessible, practical, and genuinely satisfying to master.

Why Bother Reclaiming Clay?

Clay is not cheap. A 12.5kg bag of stoneware from a supplier like Potclays, Scarva Pottery Supplies, or CTM Potters Supplies typically costs between £12 and £20 depending on the body and your location in the UK. When you are practising — and beginners practise a lot — those bags can disappear surprisingly quickly. Throwing cylinders that go wrong, hand-building slabs that crack, pinch pots that collapse: all of that clay represents real money. Reclaiming it is simply good sense.

Beyond the financial side, there is an environmental argument that many potters feel strongly about. Clay is a natural resource, and wasting it unnecessarily sits uncomfortably with the values that draw a lot of people to making pottery in the first place. Many UK community studios and pottery clubs actively encourage members to contribute to a communal reclaim bucket rather than binning their scraps. Some studios, particularly those affiliated with organisations like the Craft Potters Association, make reclaiming a fundamental part of studio culture.

There is also the learning benefit. Working through the reclaiming process teaches you a great deal about how clay behaves at different stages of dryness, how water interacts with clay particles, and how to read the material with your hands. These are skills that will make you a better potter.

Understanding the Stages of Unfired Clay

Before you can reclaim clay effectively, it helps to understand what you are working with. Unfired clay passes through several distinct stages, and knowing where your scraps sit on that spectrum determines the best approach to reclaiming them.

• Slip: Liquid clay with a creamy, pourable consistency. This is essentially clay dissolved in water and is at the furthest point from workable throwing clay.
• Soft/Plastic Clay: The ideal working consistency — smooth, flexible, holds its shape but responds to pressure. Fresh clay from the bag sits here.
• Leather Hard: Clay that has dried partially. It feels cool and firm, like cold butter, and can be carved or joined but not thrown. Still contains significant moisture.
• Bone Dry (Greenware): Completely air-dried clay with virtually no moisture remaining. It is fragile and will crumble if handled roughly, but it rehydrates readily in water.

The wonderful thing about clay at any of these stages (except once it has been fired) is that it can be broken down and reconstituted. Even bone dry pots that have not yet gone into the kiln can be dropped into a bucket of water and reclaimed. Fired clay, however, is permanent — once it has gone through the kiln, the chemical structure changes irreversibly and it cannot be reclaimed.

What You Will Need

You do not need much specialist equipment to reclaim clay at home or in a small studio. Most of these items are inexpensive and easy to source.

• A large plastic bucket or bin (at least 20 litres) for soaking
• A second bucket for collecting scraps
• Plaster bats or plaster slabs (more on these below)
• A sturdy wire cheese cutter or clay harp for cutting wedges
• A wooden or metal rib scraper
• Canvas or heavy cloth (old hessian sacking works well)
• A strong wedging surface — a piece of unglazed kiln shelf is ideal
• Rubber gloves if you have sensitive skin

Plaster bats deserve a special mention because they are central to reclaiming clay efficiently. Plaster is highly porous and draws moisture out of wet clay slip very effectively. You can buy ready-made plaster bats from most UK pottery suppliers, or you can cast your own using pottery plaster (also called potters’ plaster or #1 Pottery Plaster). Many beginners find that casting a couple of simple round or square bats is a satisfying early project. Wickes and Screwfix stock casting plaster, though for pottery-specific plaster you are better off ordering from Scarva or Potclays to get the correct grade.

One very important rule: keep plaster and clay completely separate. Even tiny fragments of plaster contaminating your clay body will cause it to explode in the kiln as the plaster heats and expands. Always work on a clean surface and never use chipped or crumbling plaster bats.

Step-by-Step: The Wet Reclaim Method

This is the most common and straightforward method for reclaiming clay, and it works beautifully for beginners. It does require a few days from start to finish, so plan ahead.

1. Collect your scraps. Keep a dedicated bucket in your workspace and add all your unfired clay scraps to it as you work — trimmings, failed pieces, leftover clay from the ends of sessions. Break larger pieces into smaller chunks so they break down more quickly.
2. Add water. Pour enough water over your scraps to fully submerge them. Do not worry about being precise — you want everything thoroughly wet. Leave the bucket with a lid on it for at least 24 to 48 hours. Bone dry pieces may need longer, sometimes up to a week, to fully slake down.
3. Stir and break down. Once the clay has absorbed water and softened, give it a thorough stir. A wooden stick or a drill with a mixing paddle attachment makes this easier. You are aiming for a smooth, lump-free slip. Any remaining lumps can be broken up by hand while wearing rubber gloves.
4. Pour onto plaster bats. Ladle or pour your slip onto clean, dry plaster bats in an even layer roughly 2 to 3 centimetres deep. Do not pour so much that it overflows. Place your bats somewhere with good air circulation — a garage, shed, or workshop is ideal.
5. Monitor the drying. Check your bats every few hours. As the plaster absorbs moisture, the clay will begin to firm up from the bottom. After several hours (the exact time depends on the thickness of your layer, the temperature, and the humidity — British weather being what it is, this can vary considerably), the edges will start to look drier than the centre.
6. Flip and peel. When the clay has firmed enough to hold its shape but still feels slightly soft, carefully peel it away from the plaster bat in sections. Flip these sections over and allow the other side to dry a little. You are aiming for a consistency that is soft but not sticky.
7. Wedge thoroughly. This is the most important step and one beginners sometimes rush. You must wedge your reclaimed clay thoroughly — either using the ram’s head method or spiral wedging — to remove air pockets, even out the moisture content throughout the clay, and restore its plasticity. Spend at least five to ten minutes wedging a 1kg piece. The clay should feel smooth, consistent, and slightly warm from the friction of your hands. If it tears or feels uneven, keep going.
8. Store correctly. Wrap your reclaimed clay tightly in plastic sheeting or a sealed plastic bag to prevent it drying out. Many potters put a slightly damp cloth inside the bag to maintain moisture over time. Label it with the clay body type if you are working with multiple clays — mixed clay bodies can behave unpredictably.

The Dry Reclaim Method: For When You Have No Plaster Bats

If you do not have plaster bats yet, or you are working somewhere without the space to set them up, there is an alternative method using canvas or heavy cloth. It is slightly slower but works well in a pinch.

Pour your slip onto a piece of tightly woven canvas laid flat on an absorbent surface. An old wooden workbench or a thick layer of newspaper underneath the canvas will help draw moisture away. Allow the slip to sit and dry naturally, checking every few hours. As with the plaster bat method, you want to catch it at the soft but not sticky stage. This method works best in warm, dry conditions — a sunny day with the shed door open, for instance — and takes considerably longer in damp or cold weather. If you are working through a British winter, expect it to take considerably longer than the instructions on packaging might suggest.

Dealing With Different Types of Clay Scraps

Most beginners start out working with a single clay body, which makes reclaiming straightforward. However, it is worth knowing how to handle different situations as your practice grows.

If you have accidentally mixed different clay bodies — say, a terracotta with a white stoneware — it is generally better to keep that batch separate and use it for non-critical practice work rather than trying to reclaim it as a reliable throwing body. Mixed clays can fire to unpredictable colours and may

have different shrinkage rates, leading to cracking or warping during drying and firing. If you are confident the clays are similar in composition and firing temperature, you may choose to test a small tile before committing the whole batch to a glaze firing, but the safest approach is to reserve mixed scraps for hand-building practice or sculptural work where consistency matters less.

Porcelain deserves a mention of its own. Because it is so white and fine-grained, it is easily contaminated by even a small amount of darker clay, and the results can be difficult to reverse. Many potters keep entirely separate reclaiming buckets, tools, and bats for their porcelain work. If you throw both stoneware and porcelain, it is worth washing your hands and sponging down your wheel head thoroughly before switching between them. Reclaimed porcelain that has been kept clean will throw beautifully and is well worth the extra care involved in keeping it separate.

Heavily grogged or textured clay bodies — those containing coarse sand or grog particles — reclaim well in terms of workability, though you may find the slop takes slightly longer to dry to a workable consistency, as the grog does not absorb water in the same way that fine clay particles do. Simply allow a little extra drying time on the plaster bat and check the texture regularly.

Conclusion

Reclaiming clay is one of the most sensible habits a potter can develop, whether you are working from a small home studio or a shared community space. It reduces waste, saves money, and encourages a more attentive relationship with your materials. Once the process becomes routine — slop bucket beside the wheel, plaster bat at the ready, a little patience during drying — it adds very little time to your practice and returns a great deal. Good clay is worth looking after, and with a straightforward reclaiming system in place, very little of it need ever go to waste.