Can I use liquid-filled expansion chamber on my lid to guarantee it is always full and topped up?Pierre-Benn de VilliersNo. Due to their weight, and subsequent change of force on the main seal, liquid-filled expansion chambers are not to be used with Flexcubes (and are unnecessary anyway). The use of such chambers will void the warranty.
Do I need to top up my Flexcube?Pierre-Benn de VilliersWithin 2 weeks of filling, the Flexcube must be topped, as the polymer walls will initially stretch. Unless the wine is undergoing primary or malolactic fermentation (when it must be vented), maintain the Flexcube completely full, the same as a traditional barrel.
What are the main cellar procedures I need to practice with my Flexcube?Pierre-Benn de VilliersUllage - Check fill height every 4-8 weeks as thermal expansion/contraction will always occur with wine temperature changes. SO2 - Check and adjust SO2 levels as you would in a traditional barrel (a typical cellar will do this every 4-8 weeks). Reductivity - If there are signs of reductivity in your wine, rack and return as you would in a traditional barrel.
What Flexcube permeability shall I use to ferment & mature Chardonnay?Pierre-Benn de VilliersBecause there is plenty of O2 available during ferment, the permeability of the Flexcube is of little influence during fermentation and immediately afterwards (say 1-2 months). So you can ferment in any permeability. For maturation, however, LP is highly recommended (essential). Chardonnay and other white 'broaden' and 'fatten' quite quickly in MP Flexcubes
Which permeability shall I use?Pierre-Benn de VilliersLow permeability is better suited for whites and those red varieties with low tannic and phenolic content (often Grenache responds better to LP). Medium permeability is the most versatile option, works very well with most Cabernets, Shiraz, Pinotage, Pinot Noir, Carmenere and Merlot. High permeability ideal for varieties with high tannic and phenolic content where a softer finish or earlier release is beneficial (Petite Syrah will often respond better in HP)
What are the choices in oxygen permeabilities available?Pierre-Benn de VilliersFlexcubes are available in three permeabilities: Low (LP) 6mg/L/yr; Medium (MP) 9mg/L/yr; and High (HP) 12mg/L/yr.
What are the small, raised ribs on the lid main seal for?Pierre-Benn de VilliersThe ribs on the main seal are for orientation, as the main seal has a 'right way up' and a 'wrong way up'. They indicate the side that should face downwards (toward the wine) - always ensure the rib on the main seal are facing downwards as fitting the seal incorrectly will reduce its sealing capability.
Can I store my Flexcubes outside?Pierre-Benn de VilliersFlexcubes are UV stabilised and when empty, can be safely stored outside. Full Flexcubes should of course be placed in a protected and preferably temperature-controlled cellar environment. Flexcubes in pearl colour are UV stable, but do pass visible light. If storing wine outside or near a window, use the opaque grey Flexcube or fit a cover. When storing empty Flexcubes, care must be taken to ensure they are clean and dry to promote a hygienic internal environment. There is no need for the use of SO2 in storing the Flexcube if it is stored clean & dry.
Can ozone be used to clean a Flexcube? Pierre-Benn de VilliersYes, the Flexcube is ozone-safe.
Shall I use hot water to clean a Flexcube?Pierre-Benn de VilliersNo. Hot water will distort the polymer and should never be used. Always clean your Flexcube with cold water and a 2% solution of caustic soda (sodium hydroxide) or similar.