FAQ

We make it from milk oolong tea, kombucha cultures and various kinds of fruit, vegetables, herbs and spices.

Milk oolong, for all flavours. It is a type of tea defined by the way the leaves are processed, not a variety: it is silky, slightly creamy and does not overpower the fruit.

Dry, sparkling, with acidity – closer to cider than to lemonade, with tea in the background. OG and Bergamot are the driest, the fruit flavours juicier and softer, Hops bitter. It is not a sweet lemonade. If the first sip seems sour, take a second one.

Eight staples:

• Kombucha *OG
• Kombucha *Passion Fruit
• Kombucha *Bergamot
• Kombucha *Strawberry/Bergamot
• Kombucha *Blueberry
• Kombucha *Cherry
• Kombucha *Mango
• Kombucha *Hops

Plus the JZT x Aura collab (raspberry, basil, lemongrass). You can buy all flavours by the bottle or pick them yourself in a Pick & mix box of 6, 12 or 36 bottles. We have three ready-made boxes: 6-pack Staples, 6-pack Fruity and Kombucha 12-pack.

In the fridge at 2–6 °C. Kombucha is live and unpasteurised: in the warmth the culture keeps working, the drink gets more sour and pressure builds up in the bottle. Once opened, consume within 24 hours.

The use-by date is on the label of every bottle. We ship so that at least 7 days remain on delivery. Consume an opened bottle within 24 hours.

Live culture. We do not pasteurise kombucha, so yeasts and pieces of culture remain in the bottle – sometimes as strands, sometimes as a small disc at the bottom. It is not a defect or mould. If you prefer no sediment, let the bottle stand for a moment and pour carefully. Do not shake, kombucha is sparkling.

A small amount forms during fermentation. The bottle contains less than 0.5% by volume, so kombucha is a non-alcoholic drink – the same limit applies to non-alcoholic beer.

Yes, a small amount. We make kombucha from tea, and caffeine is naturally present in it.

The culture consumes sugar during fermentation. Depending on the flavour, 4.4 to 6.9 g of sugars remain per 100 ml in the finished bottle, and the energy value is 75 to 117 kJ (18 to 28 kcal) per 100 ml:

• OG, Bergamot, Hops: 4.4 g sugars, 75 kJ / 18 kcal
• Strawberry/Bergamot, JZT x Aura: 5.7 g sugars, 90.1 kJ / 23.2 kcal
• Blueberry: 6.0 g sugars, 102 kJ / 24.4 kcal
• Passion Fruit, Cherry: 6.7 g sugars, 114 kJ / 27 kcal
• Mango: 6.9 g sugars, 117 kJ / 28 kcal

Full nutritional information is on the label of every bottle.

Yes, it is suitable for vegans – tea, sugar, fruit and culture, nothing of animal origin. The flavours we sell in the e-shop contain no allergens; the ingredients printed on the bottle label and shown with the product in the e-shop are always binding. Collabs that are only on tap at partner venues may have a different base – JZT x Dva kohouti, for example, is built on brewer's wort, i.e. barley malt, which contains gluten. We will gladly look up the ingredients of a specific batch for you; just write to info@jztferments.cz.

Kombucha is unpasteurised, contains caffeine from tea and a small amount of alcohol (less than 0.5% by volume). During pregnancy and breastfeeding, consult your doctor, as with other unpasteurised foods. For children the same applies as for other drinks with caffeine – we leave the decision to you.

Kombucha is acidic and does not get on with plastic. Glass does not react with it, keeps the bubbles in and can be recycled. The bottle holds 330 ml.

It is freshest straight from us, in our online shop. In Prague our own driver delivers it, to the rest of the Czech Republic it travels as a chilled Cool balík parcel, and shipping is free from 12 bottles. You can also collect your order in person in Klecany near Prague. Selected flavours are also available on Rohlik.cz and in the cafés and restaurants we work with – you will find them on our Collabs page.

A 330 ml bottle costs 100–111 CZK depending on the flavour. Better value: the 6-pack for 625 CZK, the 12-pack for 1,235 CZK or the Pick & mix box, where you mix your own flavours. Shipping costs 150 CZK and is free from 12 bottles.

Across the whole Czech Republic. Shipping costs 150 CZK and is free from 12 bottles per order – the same in Prague and in the rest of the country. Every bottle in the shipment counts towards the twelve – including bottles in boxes and sets and the ones you get free with a subscription. The home kombucha brewing kit does not count towards the 12-bottle limit: we ship the kit on its own for 150 CZK, but if you order 12 or more bottles of kombucha with it, we do not charge shipping for the kit either. We send the electronic gift card by e-mail and do not charge shipping for it; we print a physical card only on request and agree the handover with you by e-mail.

• Prague: delivered by our own driver, on working days between 1 pm and 5 pm. We usually deliver within 2 working days of order confirmation. Kombucha goes straight into the fridge, so choose an address where someone can receive it at that time.
• Rest of the Czech Republic: chilled Cool balík parcel (Messenger a.s.), usually delivered within 4 working days of order confirmation to the address you provide. We do not ship to parcel lockers or pickup points – kombucha has to stay cold.

We will let you know by e-mail when your order ships. Before public holidays or during extreme temperatures we may postpone the dispatch of chilled goods; we will let you know in good time. The maximum statutory delivery period is 30 days from the conclusion of the contract.

Yes. You can collect it directly at our production site: Zdibsko 615, 250 67 Klecany, P3 park, hall 4 – look for the door marked “Výdej zboží”. Pickup is possible on working days from 9.30 am to 3.30 pm, always by prior arrangement: write to us at info@jztferments.cz. Choose “Pickup” at checkout and wait for the e-mail saying your order is ready. You pay for the order online in advance; there is no payment on site. Pickup is free.

Online when completing your order: by payment card, Apple Pay, Google Pay, PayPal or Klarna. Payment via Klarna is a separate contractual relationship between you and Klarna under its terms, which Klarna shows you before you complete the payment. We do not offer cash on delivery or bank transfer, and there is no payment on site for pickup – you pay for the order online in advance. Prices in the e-shop include VAT; we send the tax invoice by e-mail.

Yes, as long as the shipment has not left – that is, before we hand it to the carrier or to our driver. Write to info@jztferments.cz as soon as possible and include your order number. A shipped order can no longer be changed: kombucha is chilled goods and travels straight away.

Please let us know in advance so the shipment does not travel for nothing. Chilled kombucha that comes back to us with the cold chain broken cannot be shipped again: we will therefore withdraw from the contract and refund the amount paid – the price of the goods and shipping – less the costs actually incurred by the failed delivery, with a deduction of no more than 150 CZK. We send the money without undue delay, within 14 days at the latest, in the same way we received it. If we agree on a repeat delivery, we may make it conditional on paying the shipping in advance. Details are in the Shipping and Delivery Policy and in Article 6.7 of the Terms and Conditions.

In the Pick & mix box configurator you choose the box size (6, 12 or 36 bottles), pick your flavours and choose how often the box should arrive: every week, every 2, 3 or 4 weeks. The box then comes on its own. A subscription is agreed for at least three boxes – it is for this commitment that you get extra bottles free in every box; after the third box you can cancel at any time before the date the next order is created. We charge the price automatically on the day the next order is created, from the payment method you saved with the first one (card or PayPal). The box then arrives like any other order: in Prague usually within 2 working days, in the rest of the country within 4. We will let you know about each upcoming delivery by e-mail in advance.

Every subscription box has extra bottles free: with the 6-pack you pay for 5 bottles and get 6, with the 12-pack you pay for 10 and get 12, with the 36-pack you pay for 30 and get 36. You see the price per box in the configurator as soon as you choose the frequency.

A subscription is agreed for at least three boxes – that is the consideration for the free extra bottles. During the first three boxes the subscription therefore cannot be cancelled, but you can change the flavours and frequency at any time. You may end it earlier if we materially breach our obligations (for example repeatedly fail to deliver the ordered goods), if we stop offering the goods, or if you do not agree with a change of price or terms (Articles 7.4 and 7.10 of the Terms and Conditions). After the third box you can cancel the subscription at any time before the date the next order is created, via the subscription management link in the e-mail. Or write to us at info@jztferments.cz. If we change the price or terms of a running subscription, we will let you know at least 30 days in advance and you can cancel the subscription without any penalty before the change takes effect, even if you have not yet received three boxes (Article 7.10 of the Terms and Conditions).

Yes, at any time, even during the first three boxes. The box size cannot be changed in a running subscription; the flavours and frequency can. Make the change before the date the next order is created – it will then apply to the very next box. If you only manage it after we have created the order, it applies from the delivery after that (Article 7.5 of the Terms and Conditions). If you change nothing, we send the same box as last time. If a chosen flavour is out of stock on the day the order is created, we will e-mail you before the box ships and offer you another available flavour as a substitute. You do not have to accept it: if you reply within 24 hours of that e-mail that you do not want the substitute, we cancel the delivery and refund its price without undue delay, within 14 days at the latest. If you get in touch later and the box has not left yet, we cancel it too – just write to info@jztferments.cz (Article 4.4 of the Terms and Conditions). The subscription does not end; it continues with the next box, and the cancelled delivery does not count towards the three boxes (Article 7.7 of the Terms and Conditions).

Yes, you can skip one delivery. Do it before the date the next order is due to be created – via the subscription management link in the e-mail, or write to us at info@jztferments.cz (Article 7.5 of the Terms and Conditions). The subscription does not end; the next box arrives according to the chosen frequency. If you are away more often, simply change the frequency: every week, every 2, 3 or 4 weeks.

The same as for a one-off order: 150 CZK, free from 12 bottles. All bottles in the shipment count towards the twelve-bottle limit, including the ones you get free – so the 12-pack and 36-pack subscriptions have free shipping, the 6-pack does not. You will see the shipping price for your box in the configurator and at checkout before you place the order.

The card is primarily electronic: we send it by e-mail right after payment, either to you or straight to the recipient. In the cart, tick “Send as a gift” and fill in their e-mail, a message and the sending date. We make a physical, printed card only on request – you get the code by e-mail straight away and we agree the handover and timing with you; write to us at info@jztferments.cz. We send the electronic card by e-mail and do not charge shipping for it. You can also collect it in person in Klecany, on working days from 9.30 am to 3.30 pm by prior arrangement. Values: electronic card 500, 1,000, 1,500 or 2,000 CZK, physical card 500, 1,000, 1,500, 2,000 or 5,000 CZK.

Enter the code at checkout in the “Gift card or discount code” field. You do not have to use the card up in one go; the rest stays for your next purchase. If it does not cover the order, you pay the difference another way.

For the whole e-shop range – individual flavours, boxes and sets, the Pick & mix box and the home kombucha brewing kit – and also for shipping. The card cannot be used to buy another gift card or exchanged for cash. You can redeem the card for 3 years from purchase, in several purchases if you like. If you want to use it for a subscription, write to us in advance at info@jztferments.cz and we will arrange it.

Write to us at info@jztferments.cz or via the form on the For businesses page; we will get back to you within 24 hours. We will send you a free Discovery pack: 12 bottles, a mix of the flavours we currently have in the tank. We send it to venues and companies in the Czech Republic that are considering regular orders – one pack per venue, subject to current flavour availability and with no obligation to order afterwards. Taste it with your team; in the meantime we will send you the wholesale price list. We set the order volume and delivery frequency according to the size of your operation – write to us at info@jztferments.cz and we will work it out.

Yes. Tell us how many of you there are and how often the kombucha should arrive. We can rotate the flavours according to what your people like. We send a free Discovery pack to companies too – one pack per company, subject to current flavour availability. We set the delivery volume and invoicing by agreement with you.

We can do bottles with your own label, for company events and weddings alike. Write to us at info@jztferments.cz with the number of bottles, the date and the venue – we will send you a quote and confirm the deadline for placing the order so that we can manage both the labels and the batch. We also serve kombucha from kegs, not only at events but also at venues with a tap.

JZT Ferments s.r.o., Bor 120, 360 01 Sadov, Czech Republic. Company ID 08924287, VAT ID CZ08924287. Registered in the Commercial Register kept by the Regional Court in Plzeň, Section C, Insert 38918. Premises (production, pickup, complaints and returns): Zdibsko 615, 250 67 Klecany, P3 park, hall 4 – the door marked “Výdej zboží”. E-mail: info@jztferments.cz.

No. Kombucha is a fresh food that spoils quickly, and the right to withdraw from the contract within 14 days does not apply to such goods – Section 1837(e) of the Czech Civil Code. The same applies to boxes and sets with kombucha. You can, however, cancel the order free of charge until we ship it, and defective goods are handled as a complaint. You can return the home kombucha brewing kit within 14 days of receipt. The only exception is the live SCOBY culture with starter: once you break its packaging we cannot take it back (Section 1837(g) of the Civil Code). The rest of the kit can be returned. You can also return an unredeemed gift card (within 14 days of receiving it; for an electronic card from the day we e-mailed you the code; after the code is first redeemed – even in part – this is no longer possible). Bottles with a custom label made to order, on the other hand, cannot be returned (Section 1837(d) of the Civil Code). The procedure is in the Returns and Complaints Policy.

If kombucha arrives damaged, warm, past its use-by date or spoiled (smell, mould), e-mail info@jztferments.cz with your order number, a description of the problem and a photo. You can also make a complaint by post or in person at the address of our premises – see the answer “What are your billing details?”. For a broken or warm shipment, ideally write to us within 24 hours of delivery – it is not a condition, but it helps us when dealing with the carrier. We resolve it with a new bottle, a reasonable discount or a refund – your choice. You can report a defect within two years of receipt, for kombucha no later than the use-by date on the label. The statutory period for handling a complaint is 30 days; for chilled goods, however, we do not use it up and try to resolve the complaint as soon as possible, usually within a few working days. If we failed to meet the thirty-day period, you could withdraw from the contract or demand a reasonable discount.

Sediment, haze and pieces of culture in the bottle – kombucha is unpasteurised. Nor is slightly different carbonation or acidity between batches: every batch is a little different, because it is alive. A fault caused by improper handling after delivery is not a defect either – the bottle stood outside the fridge (2–6 °C) or in the sun, was open for more than 24 hours, or you left it in the fridge past the use-by date. We will nevertheless always accept and assess your complaint; if a defect appears within one year of receipt, it is up to us to prove that the goods were not defective on receipt. If a bottle arrives already past its use-by date, or with fewer than 7 days left, that is a defect – let us know.