Bac Water 30 mL
- 0.9% benzyl alcohol
- Multi-dose
30 mL × 25 a kit
$155.00 / kit
30 mL in stock now · US orders from our US warehouse, international orders from China
30 mL bac water, by the kit of 25.
Our lead size: 25 multi-dose 30 mL vials of 0.9% benzyl alcohol bacteriostatic water in one kit, $155.00 a kit, ready to order. Also 10, 5 and 3 mL, sterile and 0.6% acetic acid water — every kit priced on the page, for one researcher or a small team, with the lot COA in every order.
- 0.9%
- Benzyl alcohol
- 28 days
- Multi-dose window
- 25 × 30 mL
- Vials per kit
- Lot COA
- With every order
US stock for US ordersInternational orders ship from China
US shipping $9.90Per order, any number of kits
Lot COA in the kitAnd on request before you pay
Pay by payment linkNo payment on the website
Our lead size
30 mL bac water, 25 vials a kit.
$155.00 / kit of 25 vials
25 multi-dose 30 mL vials of 0.9% benzyl alcohol bacteriostatic water in one kit — 750 mL, the most water per kit we sell.
- 30 mL in stock now
- US orders ship from our US warehouse; orders to other countries ship from China.
- Ships within 1–3 business days after payment is received; if anything changes, we tell you before it ships.
- Lot COA with every order; 1–19 kits at the kit price, 20+ kits quoted
Kit of 25 vials · 30 mL each · BAC30
$155.00
1 kit × $155.00 per kit
No payment on the website: our sales team confirms the price and shipping, then e-mails you a payment link — or sends it on WhatsApp. US shipping $9.90 per order; other countries quoted.
The range
Six products, each priced by the kit.
Same 0.9% preservative in every bac water size; pick the vial you finish within 28 days. Up to 19 kits of a size at the kit price, 20+ quoted.
Bac Water 10 mL
- 0.9% benzyl alcohol
- Multi-dose
10 mL × 10 a kit
$15.00 / kit
Bac Water 5 mL
- 0.9% benzyl alcohol
- Multi-dose
5 mL × 10 a kit
$14.00 / kit
Bac Water 3 mL
- 0.9% benzyl alcohol
- Multi-dose
3 mL × 10 a kit
$13.00 / kit
Sterile Water (no preservative)
- No preservative
- Single use
10 mL × 10 · 3 mL × 10 a kit
from $16.00 / kit
0.6% Acetic Acid Water
- 0.6% acetic acid
- pH 2.7–3.1
10 mL × 10 · 5 mL × 10 · 3 mL × 10 a kit
from $19.00 / kit
How ordering works
- Add kits to your order list and send the order request. There is no payment on the website.
- Our sales team confirms the price and shipping, then e-mails you a payment link — or sends it on WhatsApp.
- Your order ships within 1–3 business days after payment is received — from our US warehouse in the US, from China to other countries — with tracking and the lot COA.
Quality
Ten release tests behind every lot.
A diluent is only as good as its paperwork. Each size page lists the full specification; the certificate of your lot comes from our sales team with your order.
Certificate of analysis
From our sales team
Every order ships with the COA of its lot. Ask our sales team for the COA of a lot number you have, or of the lot we would ship — before you pay.
Request a lot's COA →- 01AppearanceClear, colourless solution
- 02IdentityWater grade review; benzyl alcohol by GC and FTIR
- 03Benzyl alcohol content0.9% ± 0.1% (v/v), GC-FID
- 04pH5.0–7.0
- 05Elemental impuritiesICP-MS, USP <233>
- 06Preservative effectivenessUSP <51>, Category 1, 28 days
- 07Fill volumeGravimetric, ±3%
- 08Particulate matterUSP <788> / <790>
- 09Bacterial endotoxins≤ 0.25 EU/mL, USP <85>
- 10SterilityNo growth, USP <71>
Size Finder
Big vials aren't always cheaper.
An opened vial is usually discarded 28 days after its first puncture. Tell the Size Finder how much you draw per week; it picks the size that wastes least and the number of kits.
Find my sizeTeam orders
Ordering for a bench or a team?
Water vials your team uses per month × months ahead = whole kits and their price, or a quote from 20 kits of a size.
Estimate my kits
The basics
What bacteriostatic water is.
0.9%
Why a preservative
Benzyl alcohol at 0.9% (v/v) holds back bacteria brought in by repeated punctures, so one vial can be used more than once. It does not sterilise a contaminated vial.
28 days
The puncture rule
Date the vial at its first puncture and discard it 28 days later unless the label says otherwise. Unopened, it keeps until the lot's expiry at 15–25 °C, away from light.
1 use
Sterile and acetic acid water
Neither has a preservative: puncture once, draw, discard the rest. Choose them when benzyl alcohol must be avoided or a low pH is needed.
| Property | Bacteriostatic Water | Sterile Water | 0.6% Acetic Acid Water |
|---|---|---|---|
| Preservative | 0.9% benzyl alcohol | None | None |
| After the first puncture | Up to 28 days | Single use | Single use |
| pH (specification) | 5.0–7.0 | 5.0–7.0 | 2.7–3.1 |
| Vial sizes | 30, 10, 5, 3 mL | 10, 3 mL | 10, 5, 3 mL |
Guides
Before you order.
Which Bac Water Size Should I Buy?
Pick the bac water vial you finish within 28 days of the first puncture: sizes, water per kit and price per mL compared, and when a small vial wins.
Read the guide →The 28-Day Rule for Opened Bac Water Vials
Why an opened bac water vial is dated and discarded 28 days after the first puncture, what counts as day one, and how single-use vials differ.
Read the guide →How to Check a Bac Water COA Before You Buy
What a useful bac water certificate of analysis shows — lot, dates, measured results against limits — the red flags, and how to get your lot's COA.
Read the guide →Bac, Sterile or Acetic Acid Water: Which One?
How bac water, sterile water and 0.6% acetic acid water differ — preservative, re-use, pH — and how to pick the one your documentation asks for.
Read the guide →FAQ
Questions, answered.
We reply within one business day. Support: Every day, 10:00–22:00 China Standard Time (UTC+8).
Do you sell single vials?
No — by the kit only: 10 vials a kit (30 mL: 25). 20+ kits of a size are quoted.
How do I pay?
No payment on the website: after you place the order, our sales team confirms the price and shipping and e-mails you a payment link — or sends it on WhatsApp. Ships within 1–3 business days after payment is received; if anything changes, we tell you before it ships.
When will my order ship?
Ships within 1–3 business days after payment is received; if anything changes, we tell you before it ships.
What does shipping cost?
United States: $9.90 per order, whatever the number of kits; there is no free-shipping threshold. Other countries are quoted with your confirmation.
What if something arrives damaged?
Damaged in transit, wrong or missing items: we reship them. A quality problem with a product: we refund it in full, agreed with our sales team.
Can I see the COA before I order?
Yes. Ask for it in the notes of your order request, or send a lot number from the Lot COA page.
What if my own lab test shows the product is out of specification?
Test it yourself. If it fails, you get a full refund. Send a vial from your order to an independent laboratory of your choice. If the report shows the lot outside our published specification — for example benzyl alcohol content, pH or sterility — share it with our sales team and we refund that product in full.