Aquablation and TURP are transurethral operations used to relieve urinary obstruction caused by BPH and benign prostate enlargement. Both physically remove obstructing prostate tissue, but Aquablation uses an image-guided high-velocity saline waterjet while TURP uses an electrosurgical loop to progressively resect tissue.
01. Aquablation vs TURP for BPH: Key Clinical Differences
What is the primary difference between Aquablation and TURP?
The fundamental difference is the technology used to remove obstructing prostate tissue and how the treatment area is planned.
Aquablation combines real-time transrectal ultrasound with a transurethral waterjet system. The surgeon defines the treatment contour using imaging, and the system directs a high-velocity saline stream through the selected prostate tissue.
TURP uses a resectoscope passed through the prostatic urethra. An electrosurgical loop progressively removes tissue in small chips under direct endoscopic vision.
Which features overlap and which remain different?
| Feature | Aquablation | TURP |
|---|---|---|
| Access | Transurethral. | Transurethral. |
| Tissue removal | High-velocity saline waterjet. | Electrosurgical loop. |
| Treatment guidance | Real-time transrectal ultrasound plus cystoscopic orientation. | Direct endoscopic visualization. |
| Automated execution | Robotic system executes the surgeon-defined resection contour. | Surgeon manually performs progressive resection. |
| Thermal cutting | Waterjet tissue cutting is nonthermal. | Electrosurgical energy cuts and coagulates tissue. |
| Hemostasis | Performed separately after waterjet resection when required. | Coagulation can occur during electrosurgical resection. |
| 30–80 mL evidence | Direct randomized comparison with TURP. | Established standard reference procedure. |
| Ejaculation | More frequently preserved. | Frequently altered after conventional TURP. |
02. How Do Aquablation and TURP Differ in Tissue Removal?
How does image-guided Aquablation differ from surgeon-controlled TURP resection?
Aquablation separates treatment planning from execution of the waterjet resection.
Real-time transrectal ultrasound provides a sagittal and transverse view of the prostate. The surgeon identifies the bladder neck, prostate contour, urethra and planned depth and extent of tissue removal.
The waterjet system then moves within that mapped contour.
TURP works in a more continuously manual fashion. The surgeon views the operative field through a resectoscope and repeatedly moves the electrosurgical loop through obstructing tissue while judging depth, bleeding and cavity shape.
Does prostate size change the comparison?
The highest-quality direct randomized Aquablation-vs-TURP evidence comes from the WATER trial, which studied prostates between 30 and 80 mL.
That range also overlaps with the conventional guideline role for TURP.
Aquablation has also been studied prospectively in glands from 80 to 150 mL. Five-year WATER II results showed durable urinary improvement and low retreatment in these larger glands.
However, WATER II was a single-arm study rather than a randomized comparison against TURP in large prostates.
Therefore, evidence that Aquablation works in 80–150 mL glands should not be misrepresented as randomized proof of superiority over TURP in that size range.
The actual gland volume can be assessed using the methods described in How Is Prostate Volume Measured?
03. Aquablation vs TURP: Ejaculation, Bleeding, Recovery and Outcomes
Which procedure better preserves ejaculation?
Preservation of ejaculation is one of the clearest differences demonstrated in randomized evidence.
In the five-year WATER trial publication, procedure-related ejaculatory dysfunction occurred in approximately 7% of Aquablation patients compared with 25% after TURP.
Other analyses using slightly different definitions and follow-up populations have also consistently found less anejaculation or ejaculatory dysfunction after Aquablation than after conventional TURP.
The difference is related partly to treatment planning. Aquablation allows the surgeon to define the resection contour and attempt to avoid tissue around structures important for ejaculation.
Preservation is nevertheless not guaranteed.
How does bleeding risk compare?
Bleeding deserves particularly careful wording because Aquablation’s waterjet itself is nonthermal.
Unlike TURP, the saline jet does not simultaneously cauterize the tissue it removes.
After Aquablation resection, the surgical team therefore assesses the cavity and controls bleeding using techniques such as focal cautery, bladder-neck cautery, catheter-balloon pressure or traction depending on the operative method.
In the WATER randomized trial, one blood transfusion occurred after Aquablation and none after TURP.
The important conclusion is therefore not that Aquablation eliminates bleeding.
Instead, the randomized trial showed fewer overall early composite safety events with Aquablation, while clinically significant bleeding remained possible in both groups.
How do catheterization and hospital recovery compare?
Recovery after both procedures involves healing of a transurethral prostate cavity.
A catheter is commonly placed after Aquablation and TURP.
In the WATER trial, hospital stay and catheter duration were broadly comparable rather than showing a major consistent advantage for either procedure.
Early symptoms after either operation may include:
- blood or small clots in the urine;
- burning during urination;
- urinary urgency;
- increased frequency;
- temporary bladder spasms;
- temporary difficulty voiding after catheter removal;
- and temporary leakage in some patients.
Recovery varies with prostate volume, treatment extent, bleeding, baseline urinary retention and individual healing.
How do urinary symptom and flow outcomes compare?
Both operations produce large improvements in urinary symptoms.
In the randomized WATER trial, mean IPSS improvement at six months was 16.9 points after Aquablation and 15.1 points after TURP. Aquablation met the trial’s criterion for non-inferiority.
At five years, mean IPSS improvement remained substantial: approximately 15.1 points after Aquablation and 13.2 points after TURP. The difference was not statistically significant.
Peak urinary flow also remained improved in both groups. Relative to baseline, five-year Qmax improvement was reported as approximately 125% after Aquablation and 89% after TURP.
| WATER trial outcome | Aquablation | TURP |
|---|---|---|
| Baseline prostate volume | 30–80 mL trial population. | 30–80 mL trial population. |
| 6-month IPSS improvement | 16.9 points. | 15.1 points. |
| 5-year IPSS improvement | 15.1 points. | 13.2 points. |
| 5-year relative Qmax improvement | Approximately 125% from baseline. | Approximately 89% from baseline. |
| Early composite safety endpoint | 26%. | 42%. |
| Procedure-related ejaculatory dysfunction | 7%. | 25%. |
How does retreatment compare?
Both treatments demonstrated durable five-year results.
In the WATER five-year analysis, the risk of needing a secondary BPH treatment—defined as restarting BPH medication or undergoing another surgical intervention for recurrent symptoms—was lower in the Aquablation arm.
The reported relative risk of secondary therapy was approximately 51% lower after Aquablation.
This is encouraging evidence for durability, but it should not be translated into a claim that Aquablation can never require retreatment.
TURP also has decades of established long-term clinical experience that extends far beyond the follow-up duration of the WATER randomized trial.
04. When Does the Difference Between Aquablation and TURP Matter Clinically?
Which factors may favor Aquablation?
Aquablation may be particularly attractive when:
- preservation of antegrade ejaculation is an important priority;
- the prostate falls within the evidence-supported treatment range;
- image-guided contour planning is clinically useful;
- the center has established Aquablation expertise;
- a larger gland makes standardized waterjet resection appealing;
- and the patient understands that bleeding control remains part of the operation.
For the full procedure mechanics, see Aquablation for BPH.
Which factors may favor TURP?
TURP may remain particularly attractive when:
- the prostate is within the conventional 30–80 mL surgical range;
- the center has extensive TURP expertise;
- Aquablation equipment is unavailable;
- an established manual resection approach suits the anatomy;
- or preservation of ejaculation is not a major treatment priority.
TURP has also accumulated decades of clinical use and long-term follow-up across many healthcare systems.
For the individual procedure, see TURP for BPH.
Does a larger prostate automatically favor Aquablation?
No.
Aquablation has prospective five-year evidence in glands from 80–150 mL. In WATER II, mean IPSS decreased from roughly 22.6 before treatment to 6.8 at five years, while maximum urinary flow increased from approximately 8.6 to 17.1 mL/s.
About 96.3% of patients were free from a secondary BPH procedure at five years.
However, WATER II did not randomize large-prostate patients against TURP.
Very large glands may also be treated with HoLEP or simple prostatectomy, depending on anatomy, local expertise and patient factors.
When should the diagnosis be reassessed before choosing either operation?
Aquablation-vs-TURP comparisons only apply when prostate-related obstruction is genuinely contributing to the urinary problem.
A weak stream, urinary frequency or an enlarged prostate alone cannot prove this.
The relationship between gland volume and symptoms is discussed in Does Prostate Size Predict BPH Symptoms?
The diagnostic pathway is covered in How Is BPH Diagnosed?
Poor detrusor contraction is especially important because neither Aquablation nor TURP directly strengthens the bladder muscle.
If the bladder generates inadequate contraction pressure, reducing outlet resistance may help but may not fully restore normal emptying.
Urethral stricture, neurological bladder dysfunction, urinary infection and other disorders can also mimic or coexist with BPH-related obstruction.
What should patients ask when comparing Aquablation and TURP?
- What is my measured prostate volume?
- How certain are we that prostate obstruction is causing my symptoms?
- Do I have a prominent median lobe or unusual bladder-outlet anatomy?
- How important is preserving ejaculation to me?
- What is my individual bleeding risk?
- Will I need to stop or modify anticoagulant or antiplatelet medication?
- How long is a catheter usually needed after each procedure at this center?
- How many Aquablation and TURP procedures does this surgeon perform?
- What are this center’s transfusion and retreatment rates?
- Would HoLEP or another procedure better fit my prostate size and anatomy?
For the complete range of procedural options, see BPH Surgery and Minimally Invasive Procedures.
Aquablation vs TURP at a Glance
| Decision factor | Aquablation | TURP |
|---|---|---|
| How tissue is removed | High-velocity saline waterjet. | Electrosurgical resection loop. |
| Procedure guidance | Real-time ultrasound plus endoscopic orientation. | Direct endoscopic visualization. |
| Who defines tissue removal? | Surgeon maps the treatment contour; robotic system executes the planned waterjet resection. | Surgeon manually controls each resection pass. |
| Heat during tissue cutting | No thermal energy in the waterjet cutting step. | Electrosurgical energy is used. |
| Hemostasis | Requires separate assessment and control after waterjet treatment. | Coagulation can be performed during resection. |
| Randomized evidence range | 30–80 mL versus TURP. | Established standard for approximately 30–80 mL glands. |
| Urinary symptom relief | Strong and durable. | Strong and durable. |
| Five-year IPSS change | About −15.1 points in WATER. | About −13.2 points in WATER. |
| Ejaculatory dysfunction in WATER | About 7%. | About 25%. |
| Erectile function | Generally preserved. | Generally preserved; no major consistent comparative disadvantage established. |
| Catheterization | Usually temporary. | Usually temporary. |
| Hospital stay | Broadly comparable in WATER. | Broadly comparable in WATER. |
| Bleeding | Can occur; nonthermal waterjet requires deliberate hemostasis. | Can occur; electrosurgical coagulation is integrated into the technique. |
| Five-year secondary BPH therapy | Lower risk in WATER. | Higher relative risk in WATER. |
| Very large glands | Prospective evidence extends through 80–150 mL. | Conventional role becomes less favorable as resection volume substantially increases. |
| Is one universally best? | No. Anatomy, gland size, ejaculation priorities, bleeding risk, bladder function and local expertise matter. | |
Summary
- Aquablation and TURP are both transurethral tissue-removing operations for benign prostatic obstruction.
- Aquablation uses a high-velocity sterile-saline waterjet; TURP uses an electrosurgical resection loop.
- Aquablation uses real-time ultrasound to help the surgeon map the planned treatment contour.
- The Aquablation robot executes the surgeon-defined resection; it does not independently decide what tissue should be removed.
- The randomized WATER trial directly compared Aquablation with TURP in prostates between 30 and 80 mL.
- Both procedures produced substantial and durable five-year improvements in urinary symptoms and urinary flow.
- Five-year mean IPSS improvement was about 15.1 points after Aquablation and 13.2 points after TURP, without a statistically significant overall difference.
- Aquablation produced fewer early composite safety events in WATER.
- Procedure-related ejaculatory dysfunction was substantially less common after Aquablation than TURP in randomized evidence.
- The nonthermal waterjet does not eliminate bleeding; active hemostasis may still be needed after Aquablation.
- Hospital stay and catheter duration were broadly comparable in the WATER trial.
- Aquablation had a lower five-year risk of secondary BPH therapy in WATER.
- Prospective evidence supports durable Aquablation outcomes in prostates from 80–150 mL, but those large-gland data were not generated from a randomized comparison against TURP.
- TURP remains an established surgical standard with extensive long-term clinical experience.
- Neither procedure directly corrects weak bladder contraction.
- No procedure is universally best; prostate anatomy, volume, obstruction severity, sexual priorities, bleeding risk and local expertise should guide selection.
Educational disclaimer: This article provides general medical education and does not recommend Aquablation, TURP or another BPH procedure for an individual. Appropriate treatment requires evaluation of urinary symptoms, prostate anatomy, prostate volume, bladder function, medical risk and individual priorities by a qualified urologist.
Explore the Prostate and BPH Pathway
For the underlying anatomy, see Prostate Health, Prostate Anatomy and Function, the Prostatic Urethra and Prostate Volume.
For the disease being treated, see BPH and Enlarged Prostate and How BPH Is Diagnosed.
Read the individual procedure guides for Aquablation for BPH and TURP for BPH.
For other large-volume tissue-removing options, see HoLEP and Simple Prostatectomy.
The preceding comparison is UroLift vs Rezūm for BPH.
For all procedural options, see BPH Surgery and Minimally Invasive Procedures.
Evidence Sources
- European Association of Urology. Management of Non-neurogenic Male LUTS — Aquablation and TURP.
- Gilling PJ, et al. Five-Year Outcomes for Aquablation Therapy Compared With TURP: Results From the WATER Randomized Trial.
- Oumedjbeur K, et al. Aquablation Versus TURP: Five-Year Outcomes in Prostates 50–80 mL.
- Bhojani N, et al. Aquablation Therapy in Large Prostates 80–150 mL: Final WATER II Five-Year Results.
- WATER versus WATER II Five-Year Update: Aquablation Outcomes Across 30–150 cm³ Prostates.
